First like a dope I didn't think it out first. LOL The motor I chose to use is self contained R/C system motors, receiver and battery pac all in on little unit. I placed it as far back as I could so it wouldn't intrude into the engine compartment. The second problem I came across is another one created by me, I used a piece of Hexagonal shaped brass for the drive axle it was a little smaller than the axles where the wheels mounted and I filed the flats down so it would fit inside the brass but as I was forcing the brass over the plastic I messed up the mesh of the gears and now they don't meet right and slip. I think I can fix the gearing I'm almost positive the gear slid back on the metal axle inside. The placement of the motor is the bigger problem I have to figure out how to drive more than one wheel so they will get traction on the tracks right now they way it is the wheel turns but doesn't even move the tracks a fraction of an inch. If the R/C part doesn't work or I can't figure it out I'll just finish the detailing and painting and worry about it later.