Fluid Pan: Service and Repair
Removal Procedure1. Raise the vehicle and support. Refer to Vehicle Lifting.
2. Place a drain pan under the transmission bottom pan in order to catch the fluid.
Important: Removing the bottom pan on the HYDRA-MATIC 4T80-E only partially drains the transaxle fluid. The side cover and the torque converter hold the remaining fluid. To drain fluid from the side cover, remove the drain plug in the case after bottom pan removal. There is no need to drain the torque converter during most service procedures.
3. Loosen the bottom pan bolts. Drain any fluid in the pan.
4. Remove the bottom pan bolts, the pan, and the seal.
5. Inspect the bottom pan for dents or nicks on the sealing surface. If damaged, replace.
Important: The bottom pan seal is not reusable. Replace with a new seal after removing the bottom pan for any service.
6. For proper sealing, clean and dry the bottom pan and the case sealing surfaces. In order to maintain proper bolt torque, the bolts and tapped holes in the case must be clean and dry.
Installation Procedure
1. Install the bottom pan, new seal, and bolts. Finger-tighten the bolts.
Notice: Refer to Fastener Notice in Service Precautions.
2. Tighten the pan bolts 3 time to the proper specification, in the sequence shown.
2.1. 1st Time: Tighten the pan bolts to 3 Nm (27 inch lbs.).
2.2. 2nd Time: Tighten the pan bolts to 6 Nm (53 inch lbs.).
2.3. 3rd Time: Tighten the pan bolts to 12 Nm (106 inch lbs.).
3. Lower the vehicle.
4. Add DEXRON(R)-III transmission fluid as required. Refer to Fluid Filter Replacement
5. If there was a complete fluid change, reset the transmission oil life indicator.