Automatic Transmission - 4L80-E - Service & Replacement: Adjustments Chevrolet Silverado 1500 HD

Park/Neutral Position Switch Adjustment

1. Place the shift lever in the neutral (N) position.
2. With an assistant in the drivers seat, raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-188958-S04533146952005091100000) .
3. Loosen the PNP switch bolts.
4. With the vehicle in neutral (N), rotate the PNP switch while the assistant attempts to start the engine.
5. Following a successful start, turn the engine off. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
6. Tighten the PNP switch bolts. Tighten Tighten the bolts to 25 N.m (18 lb ft).
7. Lower the vehicle.
8. Check the PNP switch for proper operation. The engine must start in the park (P) or neutral (N) positions only.
9. Replace the PNP switch if proper operation can not be achieved. Refer to «Park/Neutral Position Switch Replacement»(ref-188998-S32315096382005091400000) .

Scheme 1070

Scheme 1071

1. Raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-188958-S04533146952005091100000) .
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 if required.
11. Clean the transmission case and the oil pan gasket surfaces with solvent.

Scheme 1072

Scheme 1073

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. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
5. Install the oil pan bolts. Tighten Tighten the bolts to 11 N.m (97 lb in).
6. Apply a small amount of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the treads of the drain plug, if equipped.
7. Install the oil pan drain plug, if equipped. Tighten Tighten the 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-188999-S00354647062005091400000) .

Scheme 1074

Scheme 1075

1. Remove the oil level indicator.
2. Raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-188958-S04533146952005091100000) .
3. Remove the fill tube bracket nut.
4. Place a drain pan under the transmission.
5. Remove the fill tube.
6. Remove the transmission fill tube seal.

Scheme 1076

Scheme 1077

1. Install the transmission fill tube seal.
2. Install the fill tube.
3. Remove the drain pan from under the transmission.
4. Install the fill tube bracket nut.
5. Lower the vehicle. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) .
6. Install the oil level indicator. Tighten Tighten the nut to 47 N.m (35 lb ft).
7. Fill the transmission to the proper level with DEXRON® III transmission fluid. Refer to «Transmission Fluid Checking Procedure»(ref-188999-S00354647062005091400000) .

Scheme 1078

Scheme 1079

1. Raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-188958-S04533146952005091100000) .
2. Disconnect the input speed sensor electrical connector (1).
3. Remove the input speed sensor bolt.
4. Remove the input speed sensor (1).
5. Inspect the input speed sensor (1) for any evidence of damage.

Scheme 1080

Scheme 1081

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