Rear Drive Axle Cadillac CTS II

Fastener Tightening Specifications

Fastener Tightening Specifications

Lubrication Specifications

Capacities

Rear Axle Specifications

Adhesives, Fluids, Lubricants, and Sealers

Scheme 1

Scheme 2

Scheme 3

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The rear axle differential temperature sensor is a two wire sensor that is a variable resistor type. It is used by the instrument panel cluster (IPC) to monitor the temperature of the rear axle. The IPC provides a 5 volt reference and receives a signal voltage from the sensor which is mounted on the rear differential housing.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

The IPC detects signal voltage less than 0.1 V or greater than 5 V for 60 seconds.

Action Taken When the DTC Sets

The SERVICE DIFFERENTIAL SENSOR message is displayed on the IPC.

Conditions for Clearing the DTC

1. The DTC will become history if the IPC no longer detects a failure.
2. The history DTC will clear after 100 fault-free ignition cycles.

Reference Information

Schematic Reference

Rear Axle Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Drive Axle Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the IPC Rear Differential Temp Sensor parameter. The value should be .1-4.9 volts and should change with rear differential temperature.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear differential temperature sensor.
2. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC. If greater than the specified range, test the reference circuit for a short to voltage. If the circuit tests normal, replace the IPC.
3. With a scan tool, verify the IPC Rear Differential Temp Sensor parameter is less than 0.1 V. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IPC.
4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the reference circuit terminal 1. With a scan tool, verify the IPC Rear Differential Temp Sensor parameter is greater than 4.8 V. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC.
5. If all circuits test normal, test or replace the rear differential temperature sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector at the rear differential temperature sensor.
2. Test for 25-10K ohms between the sensor signal terminal 2 and the low reference circuit terminal 1. If not within the specified range, replace the rear differential temperature sensor.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Differential Temperature Sensor Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle)
2. «Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for IPC replacement, setup, and programming.

Strategy Based Diagnostics

Review the system operations in order to familiarize yourself with the system functions. Refer to Limited Slip Differential Description and Operation .

Visual/Physical Inspection

1. Inspect the system for the following: Loose or missing fasteners Obvious damage or conditions which may cause the symptom
2. Check the system for proper operation. Refer to «Limited Slip Differential Diagnosis»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__limited-slip-differential-diagnosis) .

Symptom List

Refer to the following diagnostic procedure Limited Slip Differential Chatters in Turns .

Review the system operations in order to familiarize yourself with the system functions. Refer to Rear Drive Axle Description and Operation and Wheel Drive Shafts Description and Operation . All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system problem. The diagnostic flow is the place to start when repairs are necessary. For a detailed explanation, refer to Strategy Based Diagnosis .

1. Inspect for aftermarket devices, which could affect the operation of the vehicle. Refer to «Checking Aftermarket Accessories»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions, which could cause the symptom.
3. Check for the correct lubricant level and the proper viscosity.
4. Verify the exact operating conditions under which the concern exists. Note factors such as vehicle speed, road conditions, ambient temperature, and other specifics.
5. Compare the driving characteristics or sounds, if applicable, to a known good vehicle and make sure you are not trying to correct a normal condition.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Diagnostic Starting Point - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-starting-point-vehicle)
2. «Noisy in Drive»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__noisy-in-drive)
3. «Noisy When Coasting»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__noisy-when-coasting)
4. «Intermittent Noise»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__intermittent-noise)
5. «Constant Noise»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__constant-noise)
6. «Noisy on Turns»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__noisy-on-turns)
7. «Rear Axle Lubricant Leak Diagnosis»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__rear-axle-lubricant-leak-diagnosis)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The differential cooler is designed to reduce the temperature of the rear differential fluid during high speed driving. The differential cooler system is controlled by a temperature switch (included with the differential cooler kit) located in the rear of the differential housing and functions when conditions require it to operate. The fluid capacity for the rear differential cooler is greater than the standard system.

Schematic Reference

Rear Axle Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

1. «Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the differential cooler pump relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal A2 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the ignition circuit terminal C2 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the differential cooler switch relay.
4. Verify that a test lamp illuminates between the B+ circuit terminal C1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal A2 for a short to ground.
5. Disconnect the harness connector at the differential temperature switch. Install a jumper wire between the control circuit terminal A and the ground circuit terminal B.
6. Disconnect the harness connector at the differential cooler pump.
7. Test for less than 5 ohms between the differential cooler pump ground circuit terminal 2 and ground If greater than the specified range, test the ground circuit for an open/high resistance.
8. Connect the harness connector at the differential cooler pump.
9. Connect a 20 A fused jumper wire between the B+ circuit terminal C1 and the control circuit terminal A2. Verify the differential cooler pump is activated.
10. If the differential cooler pump does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the differential cooler pump.
11. Connect a test lamp between the ignition circuit terminal C2 and the ground circuit terminal A1.
12. Turn the ignition ON and OFF. The test lamp should turn ON and OFF when changing between the selected states. If the test lamp is always OFF, test the ground circuit for an open/high resistance.
13. Ignition OFF, install the differential cooler pump relay.
14. Turn the ignition ON and OFF. The differential cooler pump should turn ON and OFF when changing between the selected states. If the differential cooler pump is always OFF, test or replace the differential cooler pump relay.
15. If all circuits test normal, test or replace the differential temperature switch.

Relay Test

1. Ignition OFF, disconnect the differential cooler pump relay.
2. Test for 60-180 ohms between terminals C2 and A1. If not within the specified range, replace the differential cooler pump relay.
3. Test for infinite resistance between the following terminals: C1 and C2 C1 and A2 C1 and A1 A1 and A2 If not the specified value, replace the differential cooler pump relay.
4. Test for less than 2 ohms between terminals C1 and A2. If greater than the specified range, replace the differential cooler pump relay.
5. Install a 20 A fused jumper wire between relay terminal C2 and B+. Install a jumper wire between relay terminal A1 and ground. Test for less than 2 ohms between terminals C1 and A2. If greater than the specified range, replace the differential cooler pump relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Differential Oil Cooler Temperature Sensor Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle)
2. «Differential Cooler Pump Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle)

Noisy in Drive

Noisy When Coasting

Intermittent Noise

Constant Noise

Noisy on Turns

Rear Axle Lubricant Leak Diagnosis

Limited Slip Differential Diagnosis

Limited Slip Differential Chatters in Turns

Inspection Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Clean any dirt from around the differential fill plug (1).
3. Remove the fill plug (1) from the differential.
4. Check the differential fluid level, it should be even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening.
5. Add new fluid if necessary. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__adhesives-fluids-lubricants-and-sealers) .
6. Install the differential fill plug (1) to the differential and tighten to 39 N.m (29 lb ft).
7. Remove the support and lower the vehicle.

Draining Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Clean any dirt from around the differential drain plug.
3. Position a drain pan under drain plug.
4. Remove the drain plug from the differential and drain the fluid.

Filling Procedure

1. Install the drain plug to the differential and tighten to 23 N.m (17 lb ft).
2. Clean any dirt from around the differential fill plug.
3. Remove the fill plug from the differential.
4. Fill the differential with 75W90 synthetic axle lubricant, GM P/N 12378261 (Canadian P/N 10953455) or equivalent. Refer to «Lubrication Specifications»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__lubrication-specifications) .
5. Inspect the gear lubricant level to ensure it is even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening.
6. Install the fill plug to the differential and tighten to 23 N.m (17 lb ft).
7. Lower the vehicle.

1. Turn ON the ignition, with the engine OFF. For vehicles equipped with Y41 passive keyless entry systems, refer to «Keyless Entry System Description and Operation (with RPO Y41)»(/cadillac/cts/ii-2007-2014/remont/door-locks-anti-theft-systems/#keyless-entry-system-and-remote-functions) or «Keyless Entry System Description and Operation (without RPO Y41)»(/cadillac/cts/ii-2007-2014/remont/door-locks-anti-theft-systems/#keyless-entry-system-and-remote-functions__keyless-entry-system-description-and-operation) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
3. Install a drain pan under the differential.
4. Disconnect the elbow (3) from the quick-connect fitting (1) in the differential housing.
5. Cap or plug the elbow to prevent dirt or debris from entering the hose.
6. Remove the quick connect fitting (1) from the differential housing.
7. Disengage the banjo fitting and drain plug adaptor (4) from differential drain hole.
8. Drain the fluid from the rear axle.
9. Purge the oil from the differential oil cooler using the following procedure. Secure the quick connect elbow over a drain pan. Insert a temperature switch bypass plug into the differential cooler temperature switch wiring harness connector. NOTE: Take care to catch excess fluid in the drain pan. Run the coolant pump for 1 minute. NOTE: Replace the differential temperature sensor gasket whenever the sensor is removed. Remove the temperature switch bypass plug from the differential cooler temperature switch wiring harness connector.

1. Clean any dirt or debris from around the fill plug opening.
2. Connect the banjo fitting and drain plug adaptor (1) to differential drain hole and tighten to 23 N.m (17 lb ft).
3. If the vehicle is equipped with a limited slip differential, add approximately 96 ml (3.25 oz) of limited slip lubricant additive to the differential. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__adhesives-fluids-lubricants-and-sealers) .
4. Fill the differential with lubricant. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__adhesives-fluids-lubricants-and-sealers) .
5. Ensure that the gear lubricant level is even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening.
6. Purge the air in the system by the following manner: Secure the quick connect elbow over a drain pan. Insert a temperature switch bypass plug into the differential cooler temperature switch wiring harness connector. NOTE: Take care to catch excess fluid in the drain pan. Run the coolant pump until a steady stream of fluid is present. Remove the temperature switch bypass plug from the differential cooler temperature switch wiring harness connector. Secure the quick connect elbow at a level above the fill opening Ensure that the gear lubricant level is even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening. Add axle lubricant as needed. Install the quick connect fitting (1) into the differential housing and tighten to 39 N.m (29 lb ft). Connect the elbow (3) to the quick connect fitting (1) in the differential housing. Insert a temperature switch bypass plug into the differential cooler temperature switch wiring harness connector. Run the coolant pump for 1 minute. Check the differential coolant system for leaks. Remove the temperature switch bypass plug from the differential cooler temperature switch wiring harness connector. Repair any leaks as needed. Remove the quick-connect fitting and recheck the fluid level taking care not to spill fluid from the cooler lines. Ensure that the gear lubricant level is even with the bottom of the fill plug hole to no lower than 6 mm (0.25 in) below the opening. Add axle lubricant as needed. Install the quick connect fitting (1) into the differential housing and tighten to 39 N.m (29 lb ft).
7. Lower the vehicle.
8. Turn OFF the ignition.

Removal Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Loosen the hose clamps for the clamps inlet and outlet hoses.
3. Remove the inlet (3) and outlet (1) hoses and clamps from the differential housing.
4. Plug or cap the outlet fitting.
5. Disconnect the electrical connector for the temperature switch (2).
6. Support the differential cooler assembly with a transmission jack or the appropriate support.
7. Disconnect the electrical connector for the differential cooler (1).
8. Remove the differential cooler wiring harness from the retainer on the frame.
9. Remove the hose from the differential coolant pump to the cooler. Refer to «Differential Oil Cooler Inlet Hose, Cooler Outlet Hose, and Pump Inlet Hose Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
10. Remove the mounting nuts (2) for the differential cooler assembly.
11. Remove the differential cooler assembly (3).
12. Disconnect the electrical connector for the differential cooler fan (1).
13. Remove the retaining nuts for the differential cooler (2).
14. Remove the differential cooler (3) from the carrier (4).

Installation Procedure

1. Install the differential cooler (3) in the carrier (4).
2. Install the differential cooler retaining nuts (2) and tighten to 9 N.m (80 lb in).
3. Install the hose from the differential coolant pump to the cooler. Refer to «Differential Oil Cooler Inlet Hose, Cooler Outlet Hose, and Pump Inlet Hose Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
4. Install the differential cooler wiring harness in the retainer on the frame.
5. Reconnect the electrical connector for the cooling fan (1).
6. Install the differential cooler assembly (3) on the rear floor.
7. Position the coolers hoses over the rear drive axle.
8. Install the mounting nuts (2) for the differential cooler and tighten to 9 N.m (80 lb in).
9. Remove the support for the differential cooler assembly.
10. Connect the electrical connector (1).
11. Remove the cap or plug from the outlet fitting.
12. Install the differential cooler inlet (3) and the outlet hose (1) and tighten the clamps to 3 N.m (27 lb in).
13. Reconnect the electrical connector (2) to the temperature switch.
14. Refill the differential cooler with the proper fluid. Refer to «Axle Lubricant Change (W/O Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) or «Axle Lubricant Change (With Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
15. Remove the support and lower the vehicle.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the differential cooler assembly. Refer to «Differential Oil Cooler Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Loosen the hoses clamps (1).
4. Remove the outlet hose (2) from the pump (6).
5. Remove the inlet hose (3) from the cooler (5).
6. Remove the hose (4) from the cooler (5) to the pump (6).

1. Install the hose (4) and clamp (1) and tighten to 3 N.m (27 lb in).
2. Install the inlet hose (3) and clamp (1) and tighten to 3 N.m (27 lb in).
3. Install the outlet hose (2) and clamp (1) and tighten to 3 N.m (27 lb in).
4. Install the differential cooler assembly. Refer to «Differential Oil Cooler Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
5. Fill the differential. Refer to «Axle Lubricant Change (W/O Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) or «Axle Lubricant Change (With Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the rear differential cooler assembly. Refer to «Differential Oil Cooler Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Disconnect the electrical connector (3) for the pump (4).
4. Remove the hose (1) from differential cooler (2) and the pump (4).
5. Disconnect the electrical connector (3) for the differential cooler (4).
6. Remove the inlet hose (2) from the pump (1).
7. Remove the mounting nuts (1) for the pump (2).
8. Remove the pump (2) from the differential cooler housing (3).

1. Install the pump (2) in the differential cooler housing (3).
2. Install the mounting nuts (1) and tighten to 9 N.m (80 lb in).
3. Install the inlet hose (2) to the pump (1) and tighten the clamp to 2.0 N.m (20 lb in).
4. Reconnect the electrical connector (3) for the differential cooler (4).
5. Install the hose (1) from the differential cooler (2) to the pump (4) and tighten the clamp to 9 N.m (80 lb in).
6. Install the rear differential cooler assembly. Refer to «Differential Oil Cooler Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
7. Refill the rear differential to the proper fluid level. Refer to «Axle Lubricant Change (W/O Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) or «Axle Lubricant Change (With Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
8. Remove the supports and lower the vehicle.

Scheme 4

Scheme 5

Rear Axle Shaft Seal and Rear Wheel Drive Shaft Flange Replacement

Special Tools

1. J 2619-01 Slide Hammer. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
2. J 24420-C Harmonic Balancer Puller
3. J 21426 Seal Installer. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the rear wheel drive shaft. Refer to «Rear Wheel Drive Shaft Replacement»(/cadillac/cts/ii-2007-2014/remont/axle-shafts/#wheel-drive-shafts) .
3. Using the J 24420-C and the J 2619-01 , remove the rear drive axle flange. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
4. Using a flat-bladed screwdriver, remove the drive axle flange axle seal (1) from the differential side cover (2).

1. Apply a small amount of clean 75W-90 synthetic gear lube, GM P/N 12378261 (Canadian P/N 10953455) to the sealing lips of the seal.
2. Using the J 21426 (1) and a hammer, install the drive axle flange seal (2) in the differential side cover (3). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Using the appropriate tool, install the wheel drive flange in the rear differential.
4. Install the rear wheel drive shaft. Refer to «Rear Wheel Drive Shaft Replacement»(/cadillac/cts/ii-2007-2014/remont/axle-shafts/#wheel-drive-shafts) .
5. Inspect the fluid level of the rear drive axle. Refer to «Rear Axle Lubricant Level Inspection»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
6. Remove the support and lower the vehicle.

Drive Pinion Flange/Yoke and/or Oil Seal Replacement (RPO LSA)

Special Tools

1. J 8614-01: Flange Holder and Remover
2. J 34826: Hub Nut Socket 36 mm
3. J 42851: Front Cover Oil Seal Installer

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the exhaust system. Refer to «Exhaust System Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) .
3. Remove the propeller shaft from the vehicle. Refer to «Rear Propeller Shaft Replacement (RPO LSA)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) .
4. Using the J 8614-01: remover (1) and the J 34826: socket (2), remove the drive pinion flange nut.
5. Using the J 8614-01: remover (3), J 8614-2 (1) and the J 8614-3 (3), remove the drive pinion flange (4).
6. Using the appropriate tool, remove the drive pinion seal (2) from the differential housing (1).

1. Remove any debris and excess gear lubricant from the pinion bore.
2. Lubricate the drive pinion flange sealing surface with the gear lubricant. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__adhesives-fluids-lubricants-and-sealers) .
3. Using the J 42851: installer (1), install the drive pinion seal to the differential housing.
4. Using the appropriate cleaning solvent, thoroughly clean the drive pinion shaft threads and the drive pinion flange nut.
5. Apply threadlocker to 2/3 of the threaded length of the pinion shaft threads. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle__adhesives-fluids-lubricants-and-sealers) .
6. Position the drive flange (2) on the pinion gear (1).
7. Install the pinion nut (3) on the pinion gear (1).
8. Using the J 8614-01: remover (1) and the J 34826: socket (2), tighten the pinion nut to 245 N.m (181 lb ft).
9. Install the propeller shaft. Refer to «Rear Propeller Shaft Replacement (RPO LSA)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft)
10. Inspect the rear drive axle lubricant level. Refer to «Rear Axle Lubricant Level Inspection»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
11. Install the exhaust system. Refer to «Exhaust System Replacement (LSA)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) .
12. Remove the supports and lower the vehicle.

Drive Pinion Flange/Yoke and/or Oil Seal Replacement (RPO LLT/LF1)

Special Tools

1. J 42851 Seal Installer. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
2. J 45012 Holding Fixture
3. J 45019 Flange and Pinion Cage Remover
4. J 34826 Hub Nut Socket (36 mm). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

1. Raise and support vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the exhaust system. Refer to «Exhaust System Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (Single)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) .
3. Remove the propeller shaft. Refer to «Rear Propeller Shaft Replacement (RPO LLT/LF1with MX7 or MN6)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RPO LLT, LF1 with MXO)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) .
4. Use the J 45012 to hold the pinion flange.
5. Using the J 34826 , remove the drive pinion nut. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
6. Using the J 45019 , remove the flange.
7. Using a flat-bladed tool, remove the drive pinion seal. Take care not to damage any sealing surfaces.

1. Apply a small amount of synthetic gear oil GM P/N 12378514 (Canadian P/N 88901045) or equivalent to the drive pinion flange sealing surface of the drive pinion seal.
2. Using the J 42851 (1), install the pinion seal (2) to the differential housing (3). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Install the J 45012 on the drive pinion shaft.
4. Install the pinion flange on the drive pinion shaft.
5. Thoroughly clean the residue from the pinion shaft threads and the pinion flange nut by using denatured alcohol or equivalent and allow to dry.
6. Apply threadlocker GM P/N 12345382 (Canadian P/N 10953489), or equivalent to 2/3 of the threaded length of the pinion shaft threads. Ensure that there are no gaps in the threadlocker along the length of the filled area of the pinion shaft threads.
7. Allow the threadlocker to cure approximately 10 minutes before installation.
8. Use the J 45012 to hold the pinion flange.
9. Using the J 34826 , tighten the drive pinion nut to 245 N. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .m (181 lb ft).
10. Install the propeller shaft. Refer to «Rear Propeller Shaft Replacement (RPO LLT/LF1with MX7 or MN6)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RPO LLT, LF1 with MXO)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) .
11. Inspect the fluid level. Refer to «Rear Axle Lubricant Level Inspection»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
12. Install the exhaust system. Refer to «Exhaust System Replacement (LF1)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (Single)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LLT)»(/cadillac/cts/ii-2007-2014/remont/exhaust/#engine-exhaust-system) .
13. Lower the vehicle.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Remove the rear propeller shaft. Refer to «Rear Propeller Shaft Replacement (RPO LSA)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RPO LLT/LF1with MX7 or MN6)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RPO LLT, LF1 with MXO)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) .
4. Drain the rear differential, if needed. Refer to «Axle Lubricant Change (W/O Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) or «Axle Lubricant Change (With Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
5. Remove the rear wheel drive shaft from the rear differential. Refer to «Rear Wheel Drive Shaft Replacement»(/cadillac/cts/ii-2007-2014/remont/axle-shafts/#wheel-drive-shafts) .
6. Place a transmission jack stand under the rear differential assembly.
7. Secure the rear differential assembly to the transmission jack stand.
8. Remove the two front differential mounting bolts (1).
9. Remove the rear mounting bolt (1) and nut (2) for the differential.
10. Lower the rear differential assembly (4) from the rear frame (1) and remove from the vehicle.
11. Replace the insulators (2) and (3) if found to be damaged or missing.

1. Install the new insulators (2) and (3), if needed.
2. Install the rear differential assembly (4) in the rear frame (1).
3. Install the rear differential mounting bolt (1) and nut (2). Tighten: Tighten the rear differential mounting nut (2) to 220 N.m (162 lb ft).
4. Install the rear differential front mounting bolts (1). Tighten: Tighten the rear differential mounting bolt (1) to 175 N.m (129 lb ft).
5. Remove the transmission jack stand.
6. Install the rear wheel drive shafts. Refer to «Rear Wheel Drive Shaft Replacement»(/cadillac/cts/ii-2007-2014/remont/axle-shafts/#wheel-drive-shafts) .
7. Install the rear propeller shaft. Refer to «Rear Propeller Shaft Replacement (RPO LSA)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RPO LLT/LF1with MX7 or MN6)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) or «Rear Propeller Shaft Replacement (RPO LLT, LF1 with MXO)»(/cadillac/cts/ii-2007-2014/remont/driveshaft-universal-joints/#propeller-shaft) .
8. Fill the differential with fluid, if needed. Refer to «Axle Lubricant Change (W/O Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) or «Axle Lubricant Change (With Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
9. Install the tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/cadillac/cts/ii-2007-2014/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
10. Remove the support and lower the vehicle.

Special Tools

J 24433 Pinion Cone and Side Bearing Installer. See Special Tools .

1. Remove the differential assembly (2) from the carrier (1).
2. Using the J 24433 and a hammer, remove the axle seal (1) from the side cover. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Using the J 24433 and a hammer, remove the axle oil seal (1) from the differential housing. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

Differential Case

1. Clean the differential case in solvent.
2. Inspect the differential case for the following conditions: Chips or cracks Damage to the bolts holes (1) Unusual wear, grooves or scoring Damaged side bearing flanges (2) Heat discoloration Worn differential pin bores (3)
3. Clean the ring gear in solvent.
4. Inspect the ring gear for the following conditions: Damage to the threaded holes (1) Unusual wear or heat discoloration to the gear teeth (2)
5. Clean the pinion flange in solvent.
6. Inspect the pinion flange for the following conditions: Splines for wear, pitting or twisting (1) Sealing surface for grooves or pitting (2)

Bearings and Races

1. Inspect the bearing rollers and races for the following conditions: Pitting Scoring or grooves Excessive wear or other damage
2. Inspect the bearing rollers and races for heat discoloration. Heat discoloration ranges from a faint yellow to a dark blue color. This discoloration may result from an overload or improper lubrication. Excessive heat causes softening of the rollers and races. Bearings or races with sign of heat discoloration must be replaced.
3. Inspect for bent bearing cages.
4. Inspect for damaged bearing cages.

Differential Housing

1. Clean the differential housing in solvent.
2. Clean and inspect the differential housing for the following: The mounting bolt threads (2) The case cover bolt hole threads (3) The sealing surface for nicks or burrs (5) The drain plug hole threads (8) The axle seal area (7) The drive pinion seal area (1) The rear differential support bushing bore (6) Front right side differential support bushing bore (9) Vent for operation (4) Cracks in the housing, if removed
3. Clean the oil passage between (1) and (2), in the axle bearing bore.

Differential Carrier Cover

1. Clean the differential carrier cover in solvent.
2. Clean and inspect the differential carrier cover for the following: Clean the oil passage between (2) Inspect the cover flat (3) for nicks and burrs. Inspect the race and shim surfaces (1)
3. Inspect the differential carrier cover exterior for the following: The mounting bolt threads (1) The axle seal mounting surface (2)

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Place a transmission jack stand under the rear differential assembly.
3. Remove the right front differential support bushing bolt.
4. Remove the left front rear differential support bushing bolt (1).
5. Remove the left differential support bushing bracket mounting bolts (1).
6. Remove the left front bushing and mounting bracket (2).
7. Remove the insulator (1) from the support bracket (2).

1. Install the NEW insulator (1) on the mounting bracket (2).
2. Position the differential support bracket assembly (1) on the differential housing.
3. Hand start the mounting bolts (1) for the support bushing mounting bracket.
4. Tighten the support bushing mounting brackets bolt. Tighten the differential mounting bracket bolts to 29 N.m (21 lb ft).
5. Lift the rear differential into position.
6. Hand start the support bushing mounting (1) by hand.
7. Install the left and right front differential support bushing mounting bolt. Tighten the differential mounting bolts to 175 N.m (129 lb ft).
8. Remove the transmission jack stand.
9. Remove the supports and lower the vehicle.

DT-48060-A Bushing Remover/Installer. See Special Tools .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the rear differential assembly. Refer to «Differential Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Remove the insulator (1) from the rear differential assembly (2).
4. Using the DT-48060-A , remove the differential housing support bushing. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

1. Using the DT-48060-A , install the differential housing support bushing. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
2. Install the insulator (1) on the rear differential assembly (2).
3. Install rear differential assembly. refer to «Differential Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
4. Remove the support and lower the vehicle.

DT-48060-A Bushing Remover/Installer. See Special Tools .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#general-information) .
2. Remove the rear differential assembly. Refer to «Differential Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Using the DT-48060-A remove the rear differential housing support bushing. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

1. Remove any dirt or debris from the support bushing bore.
2. Position the rear support bushing in the bore.
3. Using the DT-48060-A , install the rear support bushing in the differential housing. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
4. Install the rear differential assembly. Refer to «Differential Replacement»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
5. Remove the support and lower the vehicle.

Ring Gear and Differential Housing Assemble

1. Install the ring gear (2) onto the differential carrier (3).
2. Install the 10 NEW ring gear bolts (1) in order to align the gear to the hub and tighten slowly in a criss-cross pattern to 185 N.m (136 lb ft).

J 21426 Seal Installer. See Special Tools .

Assemble

1. Lightly lube the outer diameter of the seal with axle lube (1).
2. Using the J 21426 (1), install the axle oil seal (2) into the housing (3). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
3. Install the differential carrier (2) into the housing (1).
4. Lightly lube the outer diameter of the seal with axle lube.
5. Using the J 21426 (1), install the axle oil seal (2) into the differential side cover (3). See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
6. Apply a bead of silicone sealant GM P/N 12346286 (Canadian P/N 1095372) (1) 3 - 6 mm (0.118 to 0.236 in) to the side cover (2).
7. Install the differential side cover bolts (1) and tighten in a criss-cross pattern to 29 N.m (21 lb ft).
8. Install the drain plug and fill the axle with axle lube. Refer to «Axle Lubricant Change (W/O Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) or «Axle Lubricant Change (With Differential Cooler)»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .

J 42162 Getrag Axle Side Gear Compressor. See Special Tools .

Disassemble

1. Using a punch and a hammer, through a bolt hole, remove the ring gear bolts (1) and the ring gear (3) from the differential carrier (2).
2. Insert a screwdriver (2) in the differential carrier slot (1).
3. Using the screwdriver (1), separate the differential carrier (3).
4. Remove the axle side gear (107) and the clutch pack (110) from the differential carrier half (105).
5. Remove the clutch pack and axle gear from the right half. Note the thick pressure plate (109) side that has friction material faces away from the gear teeth.
6. Remove the beveled washer from the axle side gear. Note that the orientation of the beveled washer (108) faces out.
7. Mark the clutch pack (110) to indicate the position of the components.
8. Using the J 42162 and a press as shown, apply light pressure so the differential pinion gear shaft can be removed. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
9. Remove the differential pinion gear shaft (103). Release pressure from the press.
10. Remove the pinion gears (111) and washers (112).
11. Remove the clutch pack and axle gear from the left half. Note the thick pressure plate (109) side that has friction material faces away from the gear teeth.
12. Remove the beveled washer from the axle side gear. Note that the orientation of the beveled washer (108) faces out.
13. Mark the clutch pack (110) to indicate the position of the components.

Limited Slip Differential Cleaning and Inspection

1. Clean all parts with an approved solvent.
2. Visually inspect all the parts for excessive wear or breakage. Replace the parts if necessary.
3. Inspect the differential pinion gears (7) and the side gears (8) for any of the following conditions: Wear Cracks Scoring Spalling
4. Inspect the differential clutch disc packs (2). Inspect the splined differential clutch disc (3) Inspect the eared differential clutch disc (4)
5. Inspect the differential clutch disc thrust washers (5).
6. Inspect the differential thrust washers for wear (6).
7. Inspect the differential carrier case (1) and (10) for cracks and scoring.
8. Replace the differential assembly if there is damage to the differential carrier case.

J 42162 Getrag Axle Side Gear Compressor

1. Install the clutch disc thrust washers (108) on the pinion side gears with the bevel facing out.
2. Install the eared clutch disc (1) first, then the splined clutch disc (2). Repeat this patter until the clutch all the clutch disc have been installed.
3. Align all the eared clutch disc (110) before installing the clutch disc assembly in the left or right differential case halves.
4. Install the assembled axle side gear (107) into the right differential case half (105).
5. Install the assembled axle side gear (107) into the left differential case half (104).
6. Using the J 42162 and a press, apply light pressure on the pinion gears to align the pinion differential shaft bores. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/differentials-drive-axles/#rear-drive-axle) .
7. Install the differential pinion shaft (103) into the differential carrier.
8. Using the proper punch or a Phillips screwdriver, align the bolt holes between the differential case halves and lightly press them together.

Limited Slip Differential

The locking differential consists of the following components

1. Differential case
2. Pinion gear shaft
3. Differential pinion gear shaft lock pin
4. Limited Slip Differential Clutch Disc Splined (Friction material on disc and splines on the inside of disc)
5. Limited Slip Differential Clutch Disc Eared (Disc without friction material and ears to the outside of the disc)
6. Differential side gears
7. Differential clutch disc thrust washer
8. Differential pinion gears
9. Differential pinion gear thrust washers

In a conventional differential, if one wheel spins, the opposite wheel will generate only as much torque as the wheel with the least amount of traction. In a limited slip differential, part of the ring gear torque is transmitted through clutch packs which contain multiple discs. In operation, two forces engage the limited slip differential's clutches. The first is the pre-load force within the clutch packs. The second is the separating forces generated by the side gears as torque is applied through the ring gear. The limited slip design provides the action needed for turning corners and for driving in a straight line when traction is uneven. When one wheel loses traction, the clutch packs transfer additional torque to the wheel having the most traction. Limited slip differential resist wheel spin on bumpy roads and provides greater pulling power when one wheel loses traction. If both wheels slip due to unequal traction, limited slip operation is normal. Also in extreme case of unequal traction, the wheel with the least amount of traction may spin.

Differential Cooler

The differential cooler is designed to reduce the temperature of the rear differential fluid during high speed driving. The differential cooler system is controlled by a temperature switch (included with the differential cooler kit) located in the rear of the differential housing and functions when conditions require it to operate. The fluid capacity for the rear differential cooler is greater than the standard system. Refer to Lubrication Specifications .

The differential lubricant pump and cooler assembly is located under the vehicle and is mounted to the rear storage compartment well. The cooler module assembly consists of a pump, heat exchanger, electric fan, temperature switch, and assorted hoses/fittings. All components except the external lines, temperature switch, and fittings are located in the Cooler Module. Oil is pulled from the differential and pumped through a hose to the cooler/heat exchanger. The differential oil is cooled by dissipating heat as the 12 volt electric fan blows outside air over the heat exchanger. The cooled differential oil then returns to the differential. The differential cooler pump will not run until the differential fluid reaches 120C. The pump and electric fan can be turned on by bypassing the temperature switch with the plug included with the wiring harness.

Scheme 6

The differential housing, side cover and pinion housing are constructed of cast aluminum. The internal components incorporate a hypoid gear set, ring and pinion, carrier assembly and pinion housing assembly. The pinion is supported in a pinion housing by tapered roller bearings. The pinion is positioned forward of the ring gear centerline. All models have a 7 5/8 inch ring gear. Each ring gear has specific setup dimensions, A1 and A2 values, stamped onto the side area of the gear. The A1 and A2 values are unique to each ring gear/pinion and are determined during the manufacturers gear/pinion noise and vibration setup and testing.

Pinion position, ring gear position and carrier bearing preload are determined by shimming procedures.

Rear Differential Temperature Sensor (RPO LSA)

The rear differential has a temperature sensor that monitors the fluid temperature. In the event the fluid temperature exceeds 160°C (320°F), the instrument panel cluster (IPC) will display a DIFFERENTIAL HOT REDUCE SPEED message until the fluid temperature drops below 150°C (302°F). If there is a malfunction in the rear differential temperature sensor circuit, the IPC will display a SERVICE DIFFERENTIAL SENSOR message and a DTC will be set in the IPC.

The differential cooler is designed to reduce the temperature of the rear differential fluid during high speed driving. The differential cooler system is controlled by a temperature switch (included with the differential cooler kit) located in the rear of the differential housing and functions when conditions require it to operate. The fluid capacity for the rear differential cooler is greater than the standard system. Refer to Lubrication Specifications .

The differential lubricant pump and cooler assembly is located under the vehicle and is mounted to the rear storage compartment well. The cooler module assembly consists of a pump, heat exchanger, electric fan, temperature switch, and assorted hoses/fittings. All components except the external lines, temperature switch, and fittings are located in the Cooler Module. Oil is pulled from the differential and pumped through a hose to the cooler/heat exchanger. The differential oil is cooled by dissipating heat as the 12 volt electric fan blows outside air over the heat exchanger. The cooled differential oil then returns to the differential. The differential cooler pump will not run until the differential fluid reaches 120°C (248°F). The pump and electric fan can be turned on by bypassing the temperature switch with the plug included with the wiring harness.

Illustration Tool Number/Description DT 48060-A Bushing Remover/Installer J 2619-01 Slide Hammer J 8614-01 Flange Holder/ Remover J 21426 Seal Installer J 24420 Harmonic Balancer Puller J 24433 Pinion Cone and Side Bearing Installer J 34826 Hub Nut Socket - 36 mm J 42162 Getrag Axle Side Gear Compressor J 42851 Seal Installer J 45012 Holder Fixture J 45019 Flange and Pinion Cage Remover

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Wheel Drive Shafts Description and Operation
• Checking Aftermarket Accessories
• Diagnostic Starting Point - Vehicle
• Clutch Noisy
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation
• Fastener Caution
• Keyless Entry System Description and Operation (with RPO Y41)
• Keyless Entry System Description and Operation (without RPO Y41)
• Exhaust System Replacement (LSA)
• Rear Propeller Shaft Replacement (RPO LSA)
• Safety Glasses Warning
• Adhesives, Fluids, Lubricants, and Sealers
• DTC C0394
• Limited Slip Differential Diagnosis
• Limited Slip Differential Chatters in Turns
• Noisy in Drive
• Noisy When Coasting
• Intermittent Noise
• Constant Noise
• Noisy on Turns
• Rear Axle Lubricant Leak Diagnosis
• Lubrication Specifications