4L60-E/4L65-E/4L70-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Replace Torque Converter Hub-to-Oil Pump Seal Assembly)
| Subject: | 4L60-E/4L65-E/4L70-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Replace Torque Converter Hub-to-Oil Pump Seal Assembly) |
| Models: | 2007-2008 Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe, TrailBlazer |
| 2007-2008 GMC Envoy, Savana, Sierra, Yukon, Yukon XL |
| 2007-2008 HUMMER H2 |
| 2007-2008 Saab 9-7X |
| with 4L60-E, 4L65-E or 4L70-E Automatic Transmission (RPOs M30, M32 or M70) and 4.8L, 5.3L or 6.0L V8 Engine |
| Attention: | This bulletin applies to vehicles built prior to December 2007. |
Condition
Some customers may comment on an automatic transmission fluid leak. Upon further investigation, the technician may find fluid leaking from the oil pump or bell housing area.
Cause
Investigation of 2007 transmissions has shown wear of the torque converter hub-to-pump seal (243, illustrated in the Oil Pump Disassembled View in SI).
Correction
Verify that the leak is coming from the oil pump or bell housing area by the use of oil dye in the transmission. Refer to Fluid Leak Diagnosis in SI. Clean the transmission suspected area of all residual oil and drive the vehicle to see if the dye begins to appear. If the leak is coming from the bell housing, replace the torque converter seal.
Parts Information
Part Number | Description | Qty |
|---|---|---|
24202535 | Oil Pump Seal Assembly | 1 |
Warranty Information (excluding Saab U.S. Models)
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K7100 | Seal, Transmission Oil Pump - Replace | Use Published Labor Operation Time |
Warranty Information (Saab U.S. Models)
For vehicles repaired under warranty, use:
Labor Operation | Description | Failed Object | Fault/Reason Code | Location Code | Warranty Type | Repair/Action Code | Labor Time |
|---|---|---|---|---|---|---|---|
4417003 Engine Code M | Replace O-Ring Transmission Oil Pump | 44170 | 50 | 0 | 01 | 01 | Use Published Labor Operation Time |
