Possible Points of Fluid Leaks
WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Oil Pan
- Incorrectly tightened oil pan bolts
- Improperly installed or damaged oil pan gasket
- Damaged oil pan or mounting face
- Incorrect oil pan gasket
Case Leak
- Damaged or missing fill tube seal
- Mislocated fill tube bracket
- Damaged vehicle speed sensor seal
- Damaged manual shaft seal
- Loose or damaged oil cooler connector fittings
- Worn or damaged propeller shaft oil seal
- Loose line pressure pipe plug
- Warped
- Distorted torque converter housing
- Porous casting
Leak at the Torque Converter End
- Converter leak in the weld area
- Converter seal lip cut. Check the converter hub for damage
- Converter seal bushing moved forward and damaged
- Converter seal garter spring missing from the seal
- Porous casting of the transmission case or the oil pump
Leak at the Vent Pipe or the Fluid Fill Tube
- Overfilled system
- Water or coolant in the fluid-the fluid will appear milky.
- Transmission case porous
- Incorrect fluid level indicator
- Plugged vent
- Drain-back holes plugged
- Mispositioned oil pump to case gasket, if equipped
| Callout | Component Name |
|---|---|
| 1 | Wiring Harness Pass-Through Connector O-ring Seal |
| 2 | Transmission Vent Assembly |
| 3 | Converter Housing to Case Joint (Pump to Case Oil Seal) |
| 4 | Line Pressure Plug |
| 5 | Case Extension to Case Seal |
| 6 | Manual Shaft Seal |
| 7 | Case Extension Oil Seal Assembly |
| 8 | Torque Converter Assembly |
| 9 | Pump to Case Oil Seal |
| 10 | Pump Oil Seal Assembly |
| 11 | Internal Transmission Speed Sensor to Case O-ring Seal - Some Models |
| 12 | 2-4 Servo Cover O-ring Seal |
| 13 | Oil Fill Tube Seal |
| 14 | Oil Cooler Pipe Connectors |
| 15 | Transmission Case |
| 16 | Transmission Oil Pan Gasket |