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GMC Jimmy Problems

Transmission Output Seal May Leak Fluid on GMC Jimmy

Problem Description and Possible Solution

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.

(22 people reported this problem)

GMC Jimmy Vehicles With This Problem

RepairPal Verified
Average mileage: 188,166 (137,434–275,900)
Drive Trains affected: 2WD, 4WD
7 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998
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Viewing 1-6 of 6 comments
Got home from vacation to see a 4 foot wide transmission fluid river flowing from my car to my neighbors garage!!!!
tranny fluid leaks and I check the stick it says its fine.it only leaks when hot
Today fluid poured out after a half mile drive from a cold start. Lost all of the transmission fluid as it continued to pour out after parking the 1999 GMC Jimmy SLT 4WD Automatic transmission.

Drove it about a half mile and parked it, noticed a serious leak and got it back home (about a half mile) with my emergency blinkers on and it in 3rd gear. After parking it all of the fluid finished draining out. The fluid splashed all over the engine, so I could not really tell where the leak originated from.
transmission just above the transmission stick housing. I thought it was the o-ring replaced still leaking