Automatic Transmission - 4L80-E/4L85-E (Service & Replacement): Adjustments GMC Savana H2500

Park/Neutral Position Switch Adjustment

Important

1. The following procedure is for vehicles that have not had the switch removed or replaced. If the switch has been removed or replaced, refer to «Park/Neutral Position Switch Replacement»(ref-174513-S11653796062005040600000) for the proper adjustment procedure.
2. Apply the parking brake.
3. The engine must start in the P (Park) or N (Neutral) positions only.
4. Check the switch for proper operation. If adjustment is required, proceed as follows

1. Place the transmission range selector in the N (Neutral) position.
2. With an assistant in the drivers seat, raise the vehicle.
3. Loosen the park/neutral position switch mounting bolts.
4. With the vehicle in the N (Neutral) position, rotate the switch while the assistant attempts to start the engine.
5. Following a successful start, turn the engine off. CAUTION: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
6. Tighten the bolts securing the switch to the transmission. Tighten Tighten the bolts to 25 N.m (18 lb ft).
7. Lower the vehicle.
8. Check the switch for proper operation. The engine must start in the P (Park) or N (Neutral) positions only.
9. Replace the park/neutral position switch if proper operation can not be achieved. Refer to «Park/Neutral Position Switch Replacement»(ref-174513-S11653796062005040600000) .

Scheme 729

Scheme 730

1. Raise the vehicle.
2. Place a drain pan under the transmission oil pan.
3. Remove the oil pan drain plug, if equipped.
4. Remove the oil pan bolts.
5. Remove the oil pan.
6. Remove the gasket.
7. Remove the magnet.
8. Remove the oil filter.
9. Remove the filter neck seal.
10. The transmission oil pan gasket is reusable. Inspect the gasket and replace as needed.
11. Clean the transmission case and the oil pan gasket surfaces with solvent.

Scheme 731

Scheme 732

1. Install the filter neck seal.
2. Install the oil filter.
3. Install the oil pan gasket to the pan.
4. Install the magnet into the bottom of the pan. CAUTION: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
5. Install the oil pan to the transmission with seventeen bolts. Tighten Tighten the oil pan bolts to 11 N.m (97 lb in).
6. Apply a small amount of sealant GM P/N 12346004 to the treads of the drain plug, if equipped.
7. Install the oil pan drain plug, if equipped. Tighten Tighten the oil pan drain plug to 18 N.m (13 lb ft).
8. Lower the vehicle.
9. Fill the transmission to the proper level with Dexron® III transmission fluid. Refer to «Transmission Fluid Checking Procedure»(ref-174513-S27710228662005040600000) .

Scheme 733

Scheme 734

1. Remove the engine air cleaner.
2. Remove the transmission fluid level indicator from the fluid fill tube.
3. Remove the bolt and the nut securing the transmission fluid fill tube to the engine.
4. Remove the engine cover. Refer to «ENGINE COVER REPLACEMENT»(ref-176643-S02188064822005050900000) .
5. Remove the nut securing the transmission fluid fill tube to the transmission stud.
6. Remove the upper fill tube from the vehicle.
7. Raise the vehicle.
8. Support the vehicle with safety stands.
9. Remove any dirt from the transmission where the fluid fill tube enters the transmission case.
10. Remove the drain plug from the transmission. Drain the fluid into an approved container.
11. Remove the transmission fluid fill tube from the transmission. Pull the tube upward from the transmission.
12. Remove the transmission fill tube seal.
13. Clean the metal parts using solvent. Do not allow the solvent to enter the transmission.
14. Air dry the parts.

Scheme 735

1. Install a new oil level indicator tube seal into the transmission case.
2. Install the bottom of oil level indicator tube into the seal.
3. Remove the safety stands.
4. Lower the vehicle.
5. Install the upper fill tube to the vehicle. CAUTION: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
6. Install the bolt and the nut securing the oil level indicator tube brackets to the engine. Tighten Tighten the bolt to 47 N.m (35 lb ft). Tighten the nut to 25 N.m (18 lb ft).
7. Install the nut securing the oil level indicator tube to the transmission stud. Tighten Tighten the nut to 25 N.m (18 lb ft).
8. Install the air cleaner.
9. Install the engine cover. Refer to «ENGINE COVER REPLACEMENT»(ref-176643-S02188064822005050900000) .
10. Fill the transmission fluid to the proper level. Refer to «Transmission Fluid Checking Procedure»(ref-174513-S27710228662005040600000) .

Scheme 736

1. Raise the vehicle.
2. Disconnect the input speed sensor (1) electrical connector.
3. Remove the input speed sensor bolt.
4. Remove the input speed sensor (1) and the bracket assembly from the case.
5. Inspect the vehicle speed sensor assembly (1) for any evidence of damage.

Scheme 737

1. Lubricate the input speed sensor seal with automatic transmission fluid.
2. Install the input speed sensor (1) and the bracket assembly. CAUTION: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
3. Install the bolt. Tighten Tighten the bolt to 11 N.m (96 lb in).
4. Connect the input speed sensor electrical connector.
5. Lower the vehicle.

Scheme 738

1. Raise the vehicle. Important: This procedure is for 2WD vehicles. If the vehicle is equipped with 4WD, the output speed sensor is located on the transfer case.
2. Disconnect the output speed sensor (2) electrical connector.
3. Remove the output speed sensor bolt.
4. Remove the output speed sensor (2) and the bracket assembly from the case.
5. Inspect the output speed sensor assembly (2) for any evidence of damage.

Scheme 739

1. Lubricate the output speed sensor seal with automatic transmission fluid.
2. Install the output speed sensor (2) and the bracket assembly. CAUTION: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
3. Install the bolt. Tighten Tighten the bolt to 11 N.m (96 lb in).
4. Connect the output speed sensor electrical connector.
5. Lower the vehicle.

Scheme 740

Scheme 741

1. Raise the vehicle.
2. Remove the oil pan and filter. Refer to «Automatic Transmission Fluid/Filter Replacement»(ref-174513-S12235335672005040600000) .
3. Remove the park/neutral position switch. Refer to «Park/Neutral Position Switch Replacement»(ref-174513-S11653796062005040600000) .
4. Remove the manual shaft nut and the pin.
5. Remove the detent lever and the actuator assembly. ]
6. Remove the bolts and the parking pawl bracket.
7. Remove the parking pawl return spring.
8. Use the modified screw extractor in order to remove the plug.
9. Remove the parking pawl shaft retainer, the shaft and the pawl. Important: If the manual shaft binds in the case during removal, file or sand the shaft in the area adjacent to the detent lever.
10. Remove the manual shaft.
11. Remove the manual shaft seal.

Scheme 742

Scheme 743

1. Install the pawl shaft.
2. Install the parking pawl.
3. Install the plug using a 8 mm or (5/16 inch) rod with Loctite® or the equivalent.
4. Install the retainer.
5. Install the pawl return spring.
6. Install the detent lever to the actuator assembly.
7. Install actuator assembly over the parking pawl.
8. Install the manual shaft seal.
9. Lubricate the manual shaft with transmission oil and install the manual shaft into the case.
10. Install the nut on the shaft.
11. Install the roll pin. CAUTION: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
12. Install the parking lock bracket with the two bolts. Tighten Tighten the bolts to 24 N.m (18 lb ft).
13. Install the park/neutral position switch. Refer to «Park/Neutral Position Switch Replacement»(ref-174513-S11653796062005040600000) .
14. Install the oil pan and filter. Refer to «Automatic Transmission Fluid/Filter Replacement»(ref-174513-S12235335672005040600000) .
15. Lower the vehicle.
16. Fill the transmission to the proper level with Dexron® III transmission fluid. Refer to «Transmission Fluid Checking Procedure»(ref-174513-S27710228662005040600000) .