I was running my Stampede and it was doing the same thing. It ran very jerky, like the diff gear is stripped in one spot. Holding it at WOT it would act like you were revving it, pulling the front end up and dropping it, and doing that over and over. I just put a new one in it too, I hope it ain't stripped again or I'll just have to wait till I get that steel diff gear for it, one pack on a diff gear would be pointless to even bother plugging the battery into the charger for, and yes I got new plates for the slipper and it's about 1/4 turn from tight. I guess I'll take it apart again tonight and see, if it's not stripped then it's glitching. If it is glitching, how would I go about solving that problem?