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.
Transmission Output Seal May Leak Fluid on Chevrolet S10 Blazer
Average mileage: 151,399 (120,000–197,999)
Drive Trains affected: 2WD, 4WD
11 people reported this problem
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About every 3 weeks I have to add 1 or 2 quarts of transmission fluid. Its not leaking onto the ground,because I would see it on the snow at home or work! could it be that it is overfilling into the transfer case? if so, how what damage will that cause?
Transfer case full of ATF...
vacume actuator fills with tranz fluid in four wheel drive unit