3T40 Automatic Transaxle
Removal Procedure1. Raise the vehicle. Support the vehicle. Refer to Vehicle Lifting.
2. Place a drain pan under the transmission oil pan.
3. Remove the oil pan bolts from the front and the sides only.
4. Loosen the rear oil pan bolts approximately 4 turns.
Notice: Pry the oil pan down carefully in order to prevent damage to the transmission case or the oil pan sealing surfaces.
5. Lightly tap the oil pan with a rubber mallet or pry in order to allow the oil to drain.
6. Inspect the oil color. Refer to Transmission Fluid Checking Procedure.
7. Remove the remaining oil pan bolts.
8. Remove the oil pan.
9. Remove the oil pan gasket.
10. Remove the oil filter.
11. Remove the oil filter O-ring seal.
12. Inspect the O-ring seal. The O-ring seal may be stuck in the case.
13. Remove all traces of old gasket material. Clean the transmission case and the oil pan gasket surfaces with solvent, and allow to air dry.
Installation Procedure
- Tools Required
- J 36850 Transjel(TM) Transmission Assembly Lubricant
Notice: Use Transjel(TM) J 36850 or equivalent during assembly in order to retain checkballs or to lubricate components. Greases other than the recommended assembly lube will change the transmission fluid characteristics and will cause undesirable shift conditions or filter clogging.
1. Coat the seal with a small amount of J 36850 or equivalent.
2. Install a new seal into the case.
3. Install a new filter into the case.
4. Install a new oil pan gasket.
5. Install the oil pan.
Notice: Refer to Fastener Notice in Service Precautions.
6. Install the oil pan bolts.
- Tighten the bolts to 10 Nm (89 ft. lbs.).
7. Inspect the oil pan bolts and the washers.
8. Use adhesive and sealant compound GM P/N 12345382, or equivalent.
9. Lower the vehicle.
10. Fill the transmission to the proper level with DEXRON(R) III oil.
11. Adjust the cold oil level reading for the initial fill. Do not overfill. Refer to Transmission Fluid Checking Procedure.
12. Inspect the oil pan gasket for leaks.