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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 920 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information And Procedures >> Fluid Leaks from Transmission Output

Fluid Leaks from Transmission Output

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fluid Leaks from Transmission Output

Condition Action
Faulty or missing seal at output flange/yoke Install a new seal assembly in the transmission rear cover. Refer to Rear Propshaft Shaft Seal Replacement .
Machine lead on output flange/yoke seal surface Replace the flange/yoke. Refer to Output Flange/Yoke Replacement .
Rear cover porosity Repair or replace the cover.
Flange/yoke worn at seal surface Replace the flange/yoke. Refer to Output Flange/Yoke Replacement .
Insufficient sealant around seal OD Install a new seal assembly in the transmission rear cover. Refer to Rear Propshaft Shaft Seal Replacement .
Damaged or missing output bolt washer seal Replace the output bolt sealing washer. Refer to Output Flange/Yoke Replacement .
Damaged, missing, or loose output flange bolt Replace and/or torque the output flange bolt. Refer to Output Flange/Yoke Replacement .
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