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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1128 (Rear Drive Axle) >> Diagnostic Information and Procedures >> Rear Differential Carrier Leak Diagnosis

Rear Differential Carrier Leak Diagnosis

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Rear Differential Carrier Leak Diagnosis

Cause Correction
GM P/N 12378514 Hypoid Gear Oil has ultraviolet dye already included within the oil.
Drain and fill the unit with new oil before using the J 28428-E  black light, when inspecting for leaks. See Special Tools and Equipment . Ultraviolet dye J 28431-6 is not approved for use.
Restricted or damaged ventilation tube assembly Replace the ventilation tube as required.
Worn, scored, or missing drain and/or fill plug sealing washers Install new sealing washers and tighten the plugs per specifications.
Worn or damaged drive pinion oil seal
  1. Inspect the torque tube propeller shaft oil seal surface for excessive wear or damage.
  2. Inspect the torque tube propeller shaft bearings for wear or damage. A worn bearing may allow excessive movement of the propeller shaft within the torque tube.
  3. Replace the components as required.
Cut or damaged drive pinion housing O-ring seal Replace the O-ring seal as required.
Worn or damaged axle shaft oil seals Replace the axle shaft oil seals as required.
Cut or damaged clutch pump check valve O-ring seals Replace the O-ring seals as required.
Leaking clutch pump check valve Replace the clutch pump check valve assembly.
Carrier housing porosity or a leaking side cover seal surface Replace the differential assembly.
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