few reasons why I chose gear oil instead of ATF,
i drive a lot, my transfer case gets hot, I had to replace the ATF every 15 to 20.000 miles, it was cooking inside and envaporating
I had enough of that, gear oil a lot more heat tolerant than ATF.
gear oil is also a lot quieter than super thin ATF
Gear oil has cushion factor, AFF does not.
I have thoroughly checked and inspected the 242 transfer case before I made the decision to go with Gear oil, this transfer case is no different than any other transfer case that uses gear oil,
In California warm weather conditions ATF doesn’t do the job for me, gear oil is much better for all the gears and bearings inside, and that’s all it has in there .
I am using generic gear oil form NAPA
I put a brand new transfer case in 2020, last week it has about 60.000 miles on it, you see chain was stretched, it also destroyed the cooling loop inside, thankfully I always bypass the cooling loop on all my trucks, otherwise all that aluminum shavings would of killed my transmission.
Without a cooling loop, it’s a 100% isolated unit, no need to keep using ATF.
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