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Originally Posted by 687980chevy
I remember in 1980 GM got the brite idea to put ATF in their transfer cases&4spds.>better gas mileage.You could have a 80 model T-case.My 79 had 90w.The 1980's also had a slip shaft yoke on the back of the transfer case(like a th350). My 79 has the yoke bolted to the case and a slip shaft driveshaft(np205).
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It's the original transfer case from good old 1971...
I here ya Bouncy... I am 100% that the ATF has not caused any problems. To me, it's a question of seals and leaks. ATF has found it's way out of almost all of the xfer case seals. Now, I bet the gear oil will slow down the leaks considerably. Not that it will make the seals any better, but just due to a much thicker viscosity, it will not leak as much. If the transfer case was bone dry, I would consider ATF again.