mm 7700 e maxx

[suicideneil]

Thats a miracle, but seeing as you are running 9/72 and only 10.2v that would explain it. The MM motors are way too small normally, but gearing down a ton like you have will help no end. If you really wanna have some proper fun, ditch the 7700 in favour of an 8Xl or 10L feigao, and run 5s A123, with the BEC disabled (remove red wire from rx lead), and use the CC UBEC or an RX pack to power the RX. That will get you moving at closer to 40mph with tons of torque. Got any pics/video of your rig?