i'm trying to go synthetic in my diffs. the manual calls for 80w90 for the rear for temperatures between 0-90F but i cannot find a synthetic 80w90. all i can find is 75w90 royal purple and mobil 1 (which i bought for my front diff). is this good enough or is there an alternative? side note: i did the 'search' and only came up with frnt and 44d info; no 12 bolt info.

any help would be greatly appreciated. <img src="/forums/images/graemlins/notooth.gif" alt="" />
thanks
joel


joel s.
'01 trooper (the misses') and 265/75/16/C dueler AT
'95 f150 4x4, leveling coils and 32 inch maxxiss buckshots