Automatic Transmission - 4L80-E/4L85-E (Service & Replacement): Adjustments Chevrolet Suburban X

Park/Neutral Position Switch Adjustment

Important

1. The following procedure is for vehicles that have not had the park/neutral position (PNP) switch removed or replaced. If the switch has been removed or replaced, refer to PARK/NEUTRAL POSITION SWITCH REPLACEMENT for the proper adjustment procedure.
2. Apply the park brake.
3. The engine must start in the park (P) or neutral (N) positions only.
4. Check the PNP switch for proper operation. If adjustment is required, proceed as follows

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-180627-S40085739202005072800000) in General Information.
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) in Cautions and Notices.
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 .

Scheme 942

Scheme 943

Scheme 944

Scheme 945

Scheme 946

Scheme 947

1. Raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-180627-S40085739202005072800000) in General Information.
2. Place a drain pan under the transmission oil pan.
3. Remove the oil pan drain plug, if equipped.
4. Allow the transmission fluid to drain completely.
5. 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. NOTE: Refer to «FASTENER NOTICE»(ref-175132-S17785009232005041500000) in Cautions and Notices.
6. Install the oil pan drain plug. Tighten Tighten the oil pan drain plug to 18 N.m (13 lb ft).
7. Remove the drain pan from under the transmission oil pan.
8. Support the transmission with a transmission jack.
9. Remove the transmission mount nuts.
10. Remove the transmission support bolts and nuts.
11. Remove the transmission support side bracket bolts and bracket.
12. Remove the transmission support.
13. Disconnect the range selector cable end (2) from the transmission range selector lever ball stud (1). Important: It is not necessary to remove the selector cable from the bracket.
14. Remove the transmission range selector cable bracket (2) bolts and bracket from the transmission. Reposition the bracket with cable.
15. Remove the oil pan bolts. Important: The transmission oil pan gasket is reusable. Inspect the gasket and replace as needed.
16. Remove the oil pan and gasket.
17. Remove the magnet from the bottom of the pan, if necessary.
18. Remove the oil filter.
19. Remove the filter neck seal.
20. Clean the transmission case and the oil pan gasket surfaces with solvent.

Scheme 948

Scheme 949

Scheme 950

Scheme 951

Scheme 952

Scheme 953

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, if necessary.
5. Install the oil pan and bolts. Tighten Tighten the oil pan bolts to 24 N.m (18 lb ft).
6. Position the bracket with cable. Install the transmission range selector cable bracket (2) and bolts to the transmission. Tighten Tighten the selector bracket bolts to 25 N.m (18 lb ft).
7. Connect the range selector cable end (2) to the transmission range selector lever ball stud (1).
8. Install the transmission support.
9. Install the transmission support side bracket and bolts.
10. Install the transmission support bolts and nuts. Tighten Tighten the bolts/nuts to 95 N.m (70 lb ft).
11. Install the transmission mount nuts. Tighten Tighten the nuts to 40 N.m (30 lb ft).
12. Remove the transmission jack.
13. Lower the vehicle.
14. Fill the transmission to the proper level with DEXRON® III transmission fluid. Refer to «TRANSMISSION FLUID CHECKING PROCEDURE»(ref-180352-S22089691092005072700000) .

Scheme 954

Scheme 955

1. Remove the oil level indicator.
2. Raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-180627-S40085739202005072800000) in General Information.
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 956

Scheme 957

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) i in Cautions and Notices.
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-180352-S22089691092005072700000) .

Scheme 958

Scheme 959

1. Raise and suitably support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-180627-S40085739202005072800000) in General Information.
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 960

Scheme 961

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) in Cautions and Notices.
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.