Analysis of Leakage

WARNING: This page is about a different variant/trim than selected.

The power transfer unit may leak different color fluids, automatic transmission fluid and a brown/black gear lube for power transfer unit fluid. The power transfer unit seals prevent these types of fluids from leaking. Its important to note the color of fluid leaking to determine the most appropriate service procedure.

NOTE: Remove and replace leaking seals using the information found in the appropriate procedure. The specified tools called out in this procedure allows seal replacement without causing damage to the power transfer unit casing/drive gear.

NOTE: Replace the intermediate shaft seal any time the intermediate shaft is removed.

Power Transfer Unit Leaks From the RH Side

If the leak is automatic transmission fluid, the power transfer unit intermediate shaft seal needs to be replaced. This is outside on the RH side of the power transfer unit. REFER to: Intermediate Shaft Seal .

If the leak is brown/black gear lube at the case to cover seam, the power transfer unit larger cover seal needs to be replaced. This is located on the power transfer unit cover.

Power Transfer Unit Leaks From the LH Side

If the leak is automatic transmission fluid, the compression seal needs to be replaced. REFER to: Power Transfer Unit . REFER to: Intermediate Shaft Seal .

Power Transfer Unit Leaks From the Rear

If the leak is brown/black fluid, the Pinion Flange Seal/Rear Seal needs to be replaced. REFER to: Power Transfer Unit Rear Seal .

Power Transfer Unit Leaks From the Top Vent

If equipped with a vent hose, check for a missing or disconnected hose. If the PTU vent hose is present and attached correctly, check the PTU fluid level. If the PTU fluid is overfilled, replace the intermediate shaft seal, and input shaft seal. REFER to: Power Transfer Unit Input Shaft Seal . REFER to: Intermediate Shaft Seal .