Trans / Diff oil ? to use ?

[71violetcuda]

Curious as to what brand/spec/weight gear oil yall are running?  Talking A833 and 8 3/4 diff

[dodj]

I use Amsoil 75-90 extreme gear in the diff and ATF-4 in the 833.

[Chryco Psycho]

GL4 80-90w is correct for the trans , GL5 is too slippery & the syncros will not grab properly , I use the same in the diff with sure grip additive