Auto Systems and Repair
Transmission Rear Oil Seal
The transmission oil seal is the mechanical seal between the rear of the transmission and the driveshaft.
Symptoms of Wear or Failure
- Transmission fluid leak
Related Repair Advice
- If the rear transmission seal is being replaced, the sealing surface on the driveshaft should be inspected for damage. A damaged sealing surface could damage the newly installed rear seal.
- The rear transmission mount should be inspected for damage whenever a leak is noted from the rear transmission seal. An oil soaked transmission mount will quickly degrade, requiring replacement.
- On some 4WD vehicles, the rear transmission seal may leak directly into the transfer case, resulting in a low transmission fluid level with no visible leak. However, the transfer case will be over full.