well if xtm would fix the diff problem that would be nice or if anyone knows a way around it i'm sick of hearing the clicking when i accel and the mamoth is a pimp truck watch the video on xtms siteand tell me thats not durable and i have to agre on the blue thunder fuel suckin a** it tuck out my 247 if u get a cage and the bell gears that is the best thing u can do other than that the truck rocks and for the guy with the air leak call xtm and tell them that expecaly if it had that prob out the box the replaced my clutch, diff and if u go to www.dadders.net they have the best mods u can get like the center diff cost a bit but saves the rear diff saving for one myself other than that the truck rocks awsome for jumps i've jumped it over my head and i'm 5' 10" so if that tells u anything

and xtm sells a 66 and a 61 spur also but i recomend the center diff