what kind of car or truck is that you are having trouble with? i had a tmaxx for a bit but never could get the tranny to shift right. mostly its all electric dirt oval, paved oval, off road cars and trucks 2wd and 4wd, 4wd touring sedans, 1/18th scale mini-t's. i recently got some paddles and razor fronts for 1 of my mini-t's so time to try em out