Just wasted 100 bucks on new rear diff and outdrives.....Got everything from power hobby......bought power hobby brand outdrives, absolutely junk.Tried to insert them into traxxas rear diff, very tight. Then tried little tap and stuck solid. Proceeded to tap them back out and bent where axle sides in.......Have 2 sets of the outdrives so carefully tried on a front diff, no good. Didn't even attempt to tap in. Can not recommend power hobby brand outdrives for x-maxx........Any recommendations for outdrives appreciated much!!!