hi i just joined this group. i have a tmaxx 2.5 but i upgraded to 3.3 engine. ive replace stock plastic 70t spur gear witha 72t steel one. but the gear comes in contact with my throttle arm and grinds at it. also my ez start skips a little i suspect its the one way bearing. also my truck doesnt stop rolling. i have to hold the brake to keep it from idleing away. when i pick it up off the ground it revs prretty high and i know its not the idle setting. PLEASE SOMEBODY HELP ME WITH ANY OF THESE PROBLEMS !!! thanks.