The spur gear set-up on a T-Maxx will wobble sometimes because of the "friction pegs" they are not always the same length, and when new, the spur gear is floating on these pegs, so to speak. The pegs are slightly longer than the width of the spur gear hub. Once you have one apart, you can figure it out. It's actually a bad design. If you leave it loose enough to slip under severe loads, light landing from a jump, etc. it will usually wind up slipping when you don't want it to. I've smoked 2 or 3 spur gears, as they started slipping, and melted the center out, before I figured out what was going on. You usually have to tighten the adjusting nut down all the way.
