Automatic Transmission - 4R70W: Specifications Ford Expedition II

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

SHIFT SPEED CHART SPECIFICATIONS

Note. Shift speed ranges are approximate for all applications. Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

SHIFT SPEED CHART SPECIFICATIONS

STALL SPEED SPECIFICATIONS

STALL SPEED SPECIFICATIONS

SENSOR RESISTANCE SPECIFICATIONS

SENSOR RESISTANCE SPECIFICATIONS

SELECTIVE THRUST WASHER - NO. 1 SPECIFICATIONS

SELECTIVE THRUST WASHER - NO. 1 SPECIFICATIONS

FORWARD CLUTCH PACK SPECIFICATIONS

FORWARD CLUTCH PACK SPECIFICATIONS

REVERSE CLUTCH PACK SPECIFICATIONS

REVERSE CLUTCH PACK SPECIFICATIONS

DIRECT CLUTCH PACK SPECIFICATIONS

DIRECT CLUTCH PACK SPECIFICATIONS

INTERMEDIATE CLUTCH PACK SPECIFICATIONS

INTERMEDIATE CLUTCH PACK SPECIFICATIONS

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Torque Demand

The torque demand downshift occurs (automatically) during part throttle acceleration when the demand for torque is greater than the engine can provide at that gear ratio. If applied, the transmission will disengage the TCC to provide added acceleration.

Torque Converter

The torque converter transmits and multiplies torque. The torque converter is a four-element device

1. impeller assembly
2. turbine assembly
3. reactor assembly
4. clutch and damper assembly

The standard torque converter components operate as follows

1. Rotation of the converter housing and impeller set the fluid in motion.
2. The turbine reacts to the fluid motion from the impeller, transferring rotation to the geartrain through the input shaft.
3. The reactor redirects fluid going back into the impeller, allowing for torque multiplication.
4. The clutch and damper assembly dampens powertrain torsional vibration and provides a direct mechanical connection for improved efficiency.
5. Power is transmitted from the torque converter to the planetary gearsets and other components through the input shaft.

Torque Converter Clutch (TCC) Solenoid

The torque converter clutch (TCC) solenoid is used to control the apply and release of the TCC.

Torque Converter Diagnosis

Prior to installing a new or remanufactured torque converter, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of good torque converters. Only after a complete diagnostic evaluation can the decision be made to install a new torque converter.

Begin with the normal diagnostic procedures as follows

1. Preliminary inspection.
2. Know and understand the customer's concern.
3. Verify the condition - carry out the torque converter operation test.
4. Carry out diagnostic procedures. Carry out on-board diagnostics; refer to «DIAGNOSTICS»(ref-209911-S24380663312005121200000) . Repair all non-transmission related DTCs first. Repair all transmission DTCs. Rerun on-board diagnostic to verify repair. Carry out Line Pressure Test. For additional information, refer to «SPECIAL TESTING PROCEDURES»(ref-209911-S37021030102005121200000) . Carry out Stall Speed Test. For additional information, refer to «SPECIAL TESTING PROCEDURES»(ref-209911-S37021030102005121200000) . Carry out Diagnostic Routines. For additional information, refer to «DIAGNOSIS BY SYMPTOM»(ref-209911-S39797617402005121200000) . Use the Diagnosis by Symptom Index to locate the appropriate routine that best describes the symptom(s). The routine will list all possible components that may cause or contribute to the symptom. Check each component listed; diagnose and repair as required before changing the torque converter.

Torque Converter Operation Test

1. Carry out Quick Test with scan tool. For additional information, refer to «INTRODUCTION - CNG, FLEX-FUEL & GASOLINE»(ref-225317) . Check for DTCs.
2. Connect a tachometer to the engine.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.
5. Engine rpm should increase when brake pedal is tapped, and decrease about five seconds after pedal is released. If this does not occur, see torque converter operation concerns. For additional information, refer to «DIAGNOSIS BY SYMPTOM»(ref-209911-S39797617402005121200000) .
6. If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, see torque converter operation concerns. For additional information, refer to «DIAGNOSIS BY SYMPTOM»(ref-209911-S39797617402005121200000) . If the vehicle does not stall in (D), refer to «DIAGNOSIS BY SYMPTOM»(ref-209911-S39797617402005121200000) .
7. If the vehicle exhibits a vibration during the road test, complete the Road Test Evaluation Form. This form will aid the technician in determining the source of the vibration.

Note. The following is a list of common vehicle concerns that have been misdiagnosed as torque converter clutch shudder. For diagnosis of the following items refer to the appropriate sections of INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .

1. Spark plugs - check for cracks, high resistance or broken insulators
2. Plug wires
3. Fuel injector - filter may be plugged
4. Fuel contamination - engine runs poor
5. EGR valve - valve may let in too much exhaust gas and cause engine to run lean
6. Vacuum leak - engine will not get correct air/fuel mixture
7. MAP/MAF sensor - improper air/fuel mixture
8. HO2S sensor - too rich/lean air/fuel mixture
9. Fuel pressure - may be too low
10. Engine mounts - loose/damaged mounts can cause vibration concerns
11. Axle joints - check for vibration TORQUE CONVERTER ROAD EVALUATION FORM Torque Converter Road Evaluation Form 1) Does the torque converter engage/disengage? Yes GO to Step 2. No see scheme 76And see scheme 77 In «DIAGNOSIS BY SYMPTOM»(ref-209911-S39797617402005121200000) For Further Diagnosis Information. Repair As Required, Verify Converter Operation And Then Continue. 2) Does vibration occur during 3-4 or 4-3 shift at: light, medium, or heavy throttle? Light May be torque converter clutch shudder. GO to Step 3. Medium May be torque converter clutch shudder. GO to Step 3. Heavy Not torque converter clutch shudder-converter does not engage due to PCM strategy. REFER to «NOISE VIBRATION AND HARSHNESS»(ref-234572) and «ROUTINE 254/354»(ref-209911-S30341054602006081700000) for further diagnosis. 3) Is the problem vehicle speed dependent (operating at steady speed, i.e. 64 km/h (40 mph) regardless of transmission range. Verify by manually selecting 2nd, OD cancel, and OD. Yes Not torque converter clutch shudder-REFER to «NOISE VIBRATION AND HARSHNESS»(ref-234572) and «ROUTINE 254/354»(ref-209911-S30341054602006081700000) for further diagnosis. No GO to Step 4. 4) Is the problem engine-rpm dependent? (Occurs at the same engine rpm independent of transmission gear. Verify by holding same rpm in each transmission gear.) Yes Not torque converter clutch shudder-REFER to «NOISE VIBRATION AND HARSHNESS»(ref-234572) and «ROUTINE 254/354»(ref-209911-S30341054602006081700000) for further diagnosis. No GO to Step 5. 5) Does the problem occur in coast, steady speed, or reverse range? Yes Not torque converter clutch shudder-REFER to «NOISE VIBRATION AND HARSHNESS»(ref-234572) and «ROUTINE 254/354»(ref-209911-S30341054602006081700000) for further diagnosis. No GO to Step 6. 6) Does vibration occur during extended light brake application? Yes Not torque converter clutch shudder-REFER to «NOISE VIBRATION AND HARSHNESS»(ref-234572), «BRAKE SYSTEM - GENERAL INFORMATION»(ref-239929) and «ROUTINE 254/354»(ref-209911-S30341054602006081700000) for further diagnosis. No GO to Step 7. 7) If one of the driving modes in Step 2 identifies a vibration which was not present in steps 3-6, then there is a strong possibility that the vibration is caused by the torque converter clutch function. Carry out the repair procedures as found under «DISASSEMBLY AND ASSEMBLY OF SUBASSEMBLIES»(ref-209911-S35557739092005121200000).

PINPOINT TEST A: SHIFT AND TORQUE CONVERTER CLUTCH SOLENOIDS

Note. Read and record all DTCs. All Digital TR Sensor and VSS DTCs must be repaired before entering Output State Control (OSC).

Note. Refer to TRANSMISSION INTERNAL HARNESS CONNECTOR .

Note. Refer to TRANSMISSION VEHICLE HARNESS CONNECTOR .

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Fluid Leakage in Torque Converter Area

In diagnosing and correcting fluid leaks in the front pump support and gear and torque converter area, use the following procedures to locate the exact cause of the leakage. Leakage at the front of transmission, as evidenced by fluid around the torque converter housing, may have several sources. By careful observation it is possible, in many instances, to pinpoint the source of leak before removing the transmission from the vehicle. The paths which the fluid takes to reach the bottom of the torque converter housing are shown in the illustration. The five steps following correspond with the numbers in the illustration.

Scheme 27

1. Fluid leaking by the front pump seal lip will tend to move along the impeller hub and onto the back of the impeller housing. Except in the case of a total seal failure, fluid leakage by the lip of the seal will be deposited on the inside of the torque converter housing only, near the outside diameter of the housing.
2. Fluid leakage by the outside diameter of the front pump seal and front pump body will follow the same path that leaks by the inside diameter of the front pump seal follow.
3. Fluid leakage from the converter seal weld or converter to flexplate stud weld will appear at the outside diameter of the torque converter on the back face of the flexplate and in the converter housing only near the flexplate. Fluid leaks from the torque converter will leave a ring of fluid around the inside of the torque converter housing.
4. Fluid that leaks by a front pump to case bolt or pump gasket will be deposited on the inside of the torque converter housing only. Fluid will not be deposited on the back of the torque converter.
5. Engine oil leaks are sometimes incorrectly diagnosed as transmission pump gasket leaks. The following areas of possible leakage should also be checked to determine if engine oil leakage is causing the concern. Leakage at the engine valve cover gasket may allow oil to flow over the torque converter housing or seep down between the torque converter housing and cylinder block causing oil to be present in or at the bottom of the torque converter housing. Oil galley plug leaks will allow oil to flow down the rear face of the cylinder block to the bottom of the torque converter housing. Leakage at the crankshaft rear oil seal will work back to the flexplate, and then into the torque converter housing. Leakage at engine oil pressure sensor.

1. A new or remanufactured torque converter must be installed if one or more of the following statements is true: A torque converter malfunction has been determined based on complete diagnostic procedures. Converter stud or studs, impeller hub or bushing are damaged. Discoloration (due to overheating). Evidence of transmission assembly or fluid contamination due to the following transmission or converter failure modes: Major metallic failure. Multiple clutches or clutch plate failures. Sufficient component wear which results in metallic contamination. Internal torque converter contamination present. For additional information refer to «TORQUE CONVERTER CONTAMINATION INSPECTION»(ref-209911-S22932802812005121200000) .

Torque Converter Contamination Inspection

1. If a new or remanufactured torque converter is not being installed, the following steps must be completed.
2. With the torque converter on a bench, pour a small amount of transmission fluid from the torque converter onto an absorbent white tissue or through a paper filter and examine the fluid.
3. Observe the color and odor of the fluid. The fluid should be red, not brown or black. Odor may indicate an overheating condition such as clutch disc or band failure.
4. Examine the stain on the tissue for evidence of particles (spec of any kind). Examine the fluid level indicator for signs of antifreeze (gum or varnish). If particles are present in the fluid or there is evidence of engine coolant or water, a new torque converter must be installed.
5. If there are no particles or contamination present, drain the remainder of the transmission fluid from the torque converter.
6. Add 1.9 liter (2 qt.) of clean automatic transmission fluid into the converter and agitate by hand.
7. Thoroughly drain the fluid.

See also:
• JACKING & LIFTING