And since we're now over in Big Bolts, I guess I can follow up with, does anyone know where I might find the overhaul instructions for this axle? I have a 1967 GMC medium duty truck service manual, but it doesn't go into detail on the T170, so I assume that got its own tech manual.
Edit: found it!
https://67-72chevytrucks.com/vboard/showthread.php?p=5781194