i cant' see the output shaft being bent causing that much eccentric in the run. axle, maybe. take the chain off, jack up the rear and set something next to the sprocket teeth tips. Rotate the axle and see how much out of round travel you have. then do the same for the axle. Either bent axle or sprocket is not concentric to the axle.
As far as the gearbox goes. either the output shaft is a mismatch to the reverse box or you're missing something. it should slide on the shaft and come to a stop with the other half aligned for the mount brackets.
|