The transmission output shaft seal may leak transmission fluid. On 2WD models, this leak can cause the transmission mount to become oil soaked, which will require replacement of the mount along with the leak repair. On 4WD models, if this seal leaks, the fluid will leak into the transfer case, causing it to become overfull.
Car Problem Reports
GMC Jimmy Transmission Output Seal May Leak Fluid
GMC Jimmy Problem
Drive Trains Affected: 2WD, 4WD
Average Mileage: 170,858 mi (137,434 mi - 197,000 mi)
Visitor, 1996 GMC Jimmy, 4WD, 170,000 mi
transmission fluid is now in side 4wd actuator vacuum
Visitor, 1997 GMC Jimmy, 4WD, 197,000 mi
transmission just above the transmission stick housing. I thought it was the o-ring replaced still leaking
Visitor, 1995 GMC Jimmy, 4WD, 179,000 mi
Got home from vacation to see a 4 foot wide transmission fluid river flowing from my car to my neighbors garage!!!!