Update:
I had an old New Bright Abrams Tank here that I had gutted and thought I could possibly make the drive system work in the carrier. The carrier is very light so the gearbox should have no problems driving the carrier. I dissassembled the gearbox and divided it down the center into 2 separate gearboxes, and I reworked the sprokets into something I can attach the carrier sprokets to. Here are pics of the gearboxes.
