I saw a guage for diff temp the other day and was just wondering if anyone has one of these if there if much fluctuation in temp. I hav'nt seen to many people complaining about axle breakage so I was just wondering if I should need to worry about my temps back there if I plan to do any heavy pulling or sled pulling. Also was wondering if anybody has seen any aftermarket lockers for these AAM axles? I know they sell that chinese locker in the Power Wagon but I was looking for something more like an ARB.