Corvette V8-7.0L VIN E (2006)
2006-2007 GMC Yukon
2007 GMC Yukon XL
2006 Pontiac GTO
2006 HUMMER H2, H3
2006 Saab 9-7X
with 4L60-E or 4L65-E Automatic Transmission (RPOs M30 or M32)
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. This leak may be very slight with only dampness of one or two drops of ATF observed at the bottom of the bellhousing.
Cause
Investigation of 2006 transmissions has shown small scratches or cuts in the torque converter hub-to-pump seal (243). These scratches or cuts may be
caused by small burrs on the torque converter hub, pump drive slots.
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 this is a vehicle with very low mileage and it
appears to have a small leak, it could have assembly oil in the bell housing which is not truly a leak.
Once the dye has started to appear, disassemble and inspect for small cuts in the torque converter hub-to-oil pump seal assembly (243). The cuts may be
caused by small burrs on the torque converter hub, oil pump drive slots. The burrs can be seen or felt with your finger and if found, the burrs should be
removed with a file. Also replace the oil pump seal assembly. Refer to the above illustration (1).Do not replace the torque converter for this concern.
The torque converter hub-to-oil pump seal assembly leak caused by these cuts is typically very small, causing only a few drops of fluid loss.
Parts Information
Warranty Information (excluding Saab U.S. Models)
