I am in the middle of rebuilding a T-84. It is an early 1942 ford gpw model with the fill/drain on the right side. I have found that it needs 2nd and 3rd gear, the blocking rings, and the sliding gear that goes over the synchronizer assembly. I have laying around, a T-84 of unknown origin, probably out of a 2 wheel drive as the rear of the case is different. The upper gears are in great shape, and I would like to use them to save some $'s. However, this unit has no blocking rings, they are sort of built into the synchronizer assembly. Will those upper gears work in the Ford gpw T-84? Is the taper the same?.....If not, is that entire synchronizer assembly a dependable unit that I could swap in as a whole?