Automatic Transmission Fluid Leaks
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Checks |
Causes |
| Torque Converter (1) |
Inspect for damage, cracks at the lug, hub and seal welds. |
| Torque Converter Housing (203) |
- Verify leak is ATF and not oil from rear of engine.
- Inspect for housing porosity or damage.
- Inspect for worn or damaged torque converter seal (201).
- Inspect for loose line pressure plug.
- Inspect cooler line attachment for loose bolt, worn or damaged seal, or leak at line to boss joint.
- Inspect vent pipe attachment to housing and hose.
- Verify torque of housing to case bolts.
|
| Automatic Transmission Fluid Pump Seal (5) |
Inspect for cut, wear, or damage. |
| Case Assembly |
- Inspect for porosity or damage.
- Inspect manual shaft seal.
- Inspect control wiring input sleeve seals.
- Inspect rear case plugs (12) (4WD/AWD only, 4WD may also be cast over).
|
| Extension Assembly |
- Verify oil is from transmission and not transfer case assembly (4WD/AWD).
- Inspect extension seal assembly (inner seal behind boot - 2WD only).
- Inspect extension to case seal (2WD only).
|
| Pan Assembly |
- Inspect the pan assembly for damage.
- Inspect gasket for damage or wear.
- Inspect case and pan for damage and flatness at gasket interface area.
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