Tony Bullard (2/5/2019)
Maybe, just maybe and I have no idea but if the rotor (12) was not sandwiched as we thought but pressed on the yoke and the bearing contacted the end of the yoke everything would still be really tight but as Glen said the rotor could be slipping.
From what I remember, the lighter boxes with a smaller output shaft the gear sits on the yoke but overhangs the back end so it is pinched between the bearing and yoke, the bigger boxes with the big shaft it is sandwiched. I could be wrong, but that is how I remember it. I have both light (1100 series) and heavy (1400 and up) boxes in my stable of trucks, and have been inside on all of them,
In both cases, the gear is a loose (slip fit) fit and it is the yoke being pulled against the rear bearing that makes the gear turn with the yoke.
I have ordered a new gear, rear bearing seal kit, and nut, Now I need the time and will to go out in the cold to drop the driveshaft and pull it down and replace.