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Transmission Rear Oil Seal

By David Sturtz, April 14, 2008

The transmission oil seal is the mechanical seal between the rear of the transmission and the driveshaft.

Symptoms of a Bad or Failing Transmission Rear Oil Seal

  • Transmission fluid leak

Transmission Rear Oil Seal 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.

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