2WD Auto with E-Locker. Using RP10W-30 in the motor and RP 75W-90 in the rear end. I had a chance to use the locker pretty good today as I got stuck in some serious mud. I was able to spin my self out after rocking it for a bit. I was a bit concerned but was able to finish the trail and make it home just fine after sinking myself up to my sliders. Yes I was scared because I was by myself checking out a trail for a run tomorrow with a friend. Very happy with the Royal Purple Products.
I put the RP Max Gear in my Rear/Front differentials.
I keep reading that it should not go in the Manual Transmission though. I contacted Royal Purple directly and they said yes, it is fine. They also told me to put the synchromax in the transfer case. I feel this is a bit backwards...is synchromax ok to use in the transmission for a 2011 6 speed MT? i mean it says transmission fluid on the bottle but they keep recommending to use the max gear 75W-90 in the transmission and the synchromax in the transfer case.