Removal Procedure
- Raise the vehicle and support. Refer to Lifting and Jacking the Vehicle in General Information.
- Place a drain pan under the transmission bottom pan in order to catch the fluid.
- Loosen the bottom pan bolts. Drain any fluid in the pan.
- Remove the bottom pan bolts, pan, and seal.
- Inspect the bottom pan for dents or nicks on the sealing surface. If damaged, replace.
- 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.
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.
IMPORTANT:
The bottom pan seal is reusable. Replace with a new seal only if sealing surface is damaged.