Originally Posted by bakaguyjean

The F104 diff will work on your F103 and it is a better diff as it doesnt use a thrust bearing,but you need a shorter axle. Either cut yours down or order the F104 axle.The uses three bearings instead of the two in the F103 diff making it smoother, Also you can take the wheel off without looseing the diff.
But you still need the left wheel stopper so the diff doesnt do you any good.