We have a new (old) '82 GMC shortbox.
It came from the factory as a 1/2-ton 4x4 with a 305 engine and a
Now it sports 3/4-tons diffs, a 350 and a TH-400.
I have no idea what year the diffs came from.
So far I have been able to obtain replacements for the parking brake,
the brake hoses, shoes, and the master cylinder.
The brake hardware kits from NAPA seem to be mix and match when
compared with what was on the truck.
The hardest part to pin down is the brake drum.
11-5/32" x 2-3/4"
Put the drum on a flat surface and measure up through the center hole
and you get 5-5/8"
The replacement drums (for a 1979) from NAPA measure 4-3/4" and
obviously will not fit.
Guess I will have to pay a re-stocking fee.
Does anyone have an idea what years my drums are likely from?