The tractor is back together and the auction company I purchased it from covered the full repair bill. The original location of the bushing found in the gearbox was on the 4wd shaft where it goes through the case. Dealer thinks someone has had the shaft out before and dropped it? The tractor is still at the dealer getting a full service and some minor things I want repaired (flasher switch that won't stay off, broken clutch return spring, loader valve boot). Grateful I'll be able to keep the tractor, it's exactly what I've been looking for. The auction company offered to buy it back if we couldn't get it resolved.