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so this weekend i'ma change the oil in the rear dif, t-case. not doing the front dif as i checked it and it's color is still nice and clean looking, i know i spins all the time but under no load maybe kept it cleaner longer.

for the rear the manual calls for a synthetic 75-90, will the normal conventional, 80-90 be ok? i have a few gallons of this on the shelf.

the t-case calls for atf+4, however my 93 toyota calls for atf as well and i use 30 weight non detergent oil in it. would that be ok in the tcase on my dodge as it is in the toyota??

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As for the transfer case you can use ATF+3. I've been doing that since brand new. No issues.

If it's limited slip then you are stuck to the synthetic 75w-90. As for open diff I've been running 85w-90 all these years no issues. 

You can run the regular 80-90 but if you tow heavy I would change it more often but like Mike said if its a limited slip I would definitely stick with the synthetic 75-90 as well..

As far as the t-case I would definitely stick with atf.

Edited by Wild and Free