Just bought a '92 Toyota pickup 4X4, and the manual tranny is real notchy and tough to get into 1st gear sometimes, this is usually an indication that GL-5 has been put in the tranny, as Toyota manual's don't like GL-5 all that much, shifting wise, not talking about the whole sulfur eating at the yellow metals thing, don't want to get into that. Anyway, I am gonna order some Redline MT-90 GL-4 to put in it, but was just wondering if MT-90 is good for a Xfer case also, might as well put the MT-90 in there while I'm under there, but not sure if I should use straight gear oil. I don't think Xfer cases use hypoid gears, so I would assume that a good synthetic GL-4 like MT-90 would be good in there. Any advise? Thanks.