Right angle gearbox, is needed when racers are running a vertical shaft engine( crank is out of the bottom of the chassis) to get the chain aligned to rear axle.
Gearbox is 1 to 1 ratio, aluminum case, two 3/8" bolt holw mounting flange with 4" bolt circle.
Input shaft diameter 7/8" keyed. Output shaft diameter 3/4" keyed with 5/8"-18 threaded.
There is no warrenty on this gearbox of ay kind. You are buying at your own risk!