Fluid Leak Diagnosis - Rear Driveline Module

Fig. 1:

When diagnosing fluid leaks on the rear drive line module assembly two weep holes are provided to diagnose certain seal leaks. These holes are located on the bottom side of the assembly (Fig. 1).

If fluid leak is detected from either weep hole, seal replacement is necessary. Do not attempt to repair the leak by sealing weep holes, they must be kept clear of sealants for proper seal operation.

If fluid is leaking from weep hole "A" (Fig. 1) and it is automatic transmission fluid, the front overrunning clutch seal is leaking. For replacement of this seal, refer to Rear Drive Line Assembly Service Procedures.

If fluid is leaking from weep hole "B" (Fig. 1) the type of fluid leaking will determine which seal is leaking. If the fluid leaking is red in color (transmission fluid) this indicates that the rear overrunning clutch seal should be replaced. If the fluid leaking is light brown (hypoid gear lube) this indicates that the drive pinion seal should be replaced. For replacement of these seals refer to Rear Drive Line Assembly Service Procedures.