Automatic Transmission Fluid Leaks
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Automatic Transmission Fluid Leaks
| 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.
|
| Cooler Lines/Coolers |
- Inspect and follow cooler lines to front radiator and external coolers.
- Some vehicles may have rear differential external and internal coolers.
|