I just filled up my Conquest with Royal Purple all around, it takes Max Gear 75w90 with added friction modifier for both the tranny and LSD, when I called Royal Purple I was informed that their Synchromax aka Manual Transmission oil is made for manuals that require ATF fluid and their Gear Max oil can be used in both transmission and differential.

And since the differential and the gears are in the same housing does it still require friction modifier or is that only for LSDs?