Possible Points of Fluid Leaks
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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
- Porous casting warped torque converter housing
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 |
|---|---|
| 3 | Bolt and Seal Assembly, A/Trans O/Pump |
| 5 | Seal, A/Trans Oil Pump |
| 8 | Connector, Transmission Oil Cooler Pipe |
| 9 | Pipe, Vent |
| 15 | Seal, Case Extension |
| 20 | Seal Asm., Prop Shaft Front Slip Yoke Oil |
| 22 | Sensor Assembly, A/T Input Speed and 2WD Output Speed (4WD Plug) |
| 24 | Plug, Line Pressure Test Hole |
| 27 | Bolt, Oil Pan |
| 29 | Seal, Transmission Oil Pan |
| 34 | Harness Assembly, A/Trans Wiring |
| 201 | Seal Asm., Torque Converter Oil |
| 707 | Seal, Manual Shift Shaft |