Yes, the box cranks over engines fine. They made the rubber wheel small so it can fit into small openings in the chassis and give more cranking torque with the two 550 motors. Only thing is that it has no 7.2 battery hold-down clamps.
You have to tie-wrap them down as shown in the instructions. I put foam strips under my stick packs and double tie wrapped them down. I really like they way it converts to left, right or onroad style starting wheel positions.