I'm having trouble with my T-Maxx trans, I can't keep gears in it. I've had it apart 5 times now, always the same gear, 4998, the reverse output gear. I contacted T-Maxx support, they were good enough to send me another set of gears, (set # 3), not sure what to do next. My daughter and a friend of mine both have trucks we all bought at the same time, no problems with theirs. Maybe I just got a lemon, my engine is toast too, the head was leaking, tried to tighten the head screws, 2 of them were stripped.......Coop