Originally Posted by caglareric

I have a one way bearing which lets the 1st gear spur freely spin whilst its in 2nd, so, if I tried to reverse, it would just spin the spur backwards without the actual wheels turning.

I have an idea in theory but not sure how well it would do if I actually did them.

On my transmission, I have a clutch bell with an already threaded hole to mount the inner parts to the shaft, it currently has a grub screw in there which allows the outer casing of the clutch to spin freely until the clutch catches onto it which in turn spins the spur. My idea is to put a longer screw in there so that the out and inner parts of the clutch are locked, therefore, it will turn the wheels both ways. The only issue i may face with this is that the torque may bend/brake the screw or clutch casing.

If that fails, apparently there is a traxxas spur gear which would mount straight on, however its only a 34 teeth spur where as mine is a 47 teeth.

I have bought a set of pinions that range from 15t to 20t so hopefully one of them should do the trick.