Repairing the Leak

NOTE:
^ The cause of most external leaks can generally be located and repaired with the transmission in the vehicle.
^ Once the leak has been pinpointed and traced back to its source, the cause of the leak must be determined in order for it to be repaired properly. If a gasket is replaced, but the sealing flange is bent, the new gasket will not repair the leak. The bent flange must also be repaired. Before attempting to repair a leak, check to be sure that the following conditions are correct as they may cause a leak.

GASKETS
- Oil level or pressure is too high.
- Plugged vent or drain-back holes.
- Improperly tightened fasteners or dirty/damaged threads.
- Warped flanges or sealing surface.
- Scratches, burrs, or other damage to the sealing surface.
- Damaged or worn gasket.
- Cracking or porosity of the component.
- Improper sealant used (where applicable).

SEALS
- Oil level or pressure is too high.
- Plugged vent or drain-back holes.
- Damaged seal bore (scratched, burred, or nicked).
- Damaged or worn seal.
- Improper installation.
- Cracks in component.
- Manual or output shaft surface scratched, nicked, or missing.
- Loose or worn bearing causing excess seal wear.