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.Google+
Car Problem Reports
Chevrolet Blazer Transmission Output Seal May Leak Fluid
Chevrolet Blazer Problem
Drive Train Affected: 4WD
Average Mileage: 125,306 mi (65,000 mi - 169,532 mi)
Visitor, 2001 Chevrolet Blazer, 4WD, 135,000 mi
There is trans fluid leaking out of the seal from the transfer case. Im not sure if its the over feeling of the tranny due to the seal, or if the seal is just bad on the transfer case.
Visitor, 1996 Chevrolet Blazer, 4WD, 137,000 mi
Trans leaked fluid out into transfer case-which pumped it out of vent tube on top of trans and gave appearance of trans line leak-found transfer case 3 quarts overfull-drained & refilled trans & problem re occured----(bought blazer used) replace output shaft seal and appears to have fixed problem
My Transmission is leaking and I am hearing a thump under my truck!
Visitor, 1995 Chevrolet Blazer, 4WD, 65,000 mi
Auto tranny pumping ATF into the transfer case.I lost two quarts and the Transfer case was two quarts overfill. Trying a conditioner to soften the seal. No Luck! Will call a tranny place tomorrow to see what the cost is. Vehicle may not be worth it! ROD
Visitor, 1995 Chevrolet Blazer, 4WD, 120,000 mi
Tranny fluid leaked out into transfer case, burned up transmission