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I dunno, we've run ATF in transfer cases for years.  It's an EP type lubricant, basically rated GL4.  It's not like you're dealing with shift quality in an xfer case, it's just gear load and bearings.  Same types of bits and pieces that are inside your auto trans.


GL5 (hypoid) type lubricants aren't required for trans/transfer case.  Only hypoid diffs.


Check with trailgear to see if you can run ATF, or if they specifically recommend PS fluid.


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