well i found out i have to hack to motor cradle to get this in there. and custom make the pinion. luckily i ordered 2 sets of pinion gears. and i glued them end to end. this is the only way it is going to reach from the motor to the spur gear. here's some pics.
and no i didnt want to hack the cradle off of the chassis so i grabbed a beater partial chassis.
