[MADMIKE]

FWIW the MC pulled off the truck was indeed a 1-1/8" bore. *shrug* For S&G I called around to local stores to see if they had a MC for a '70 GMC 2500 w/PB, those that did had the screw on cover. So I don't know what the MC was that was underhood. Currently the Centric 130.64001 is bench bled and installed. Awesome.

So my neighbor was tired of looking at disc brake parts and stated he wanted to get to work on the rear drums last night, so we did.
Put the rear on stands, pulled the axles, wheels, then the drum/hubs. A little bass ackwards but meh it was fun and fast. I'm not familiar with Danas, nor floater rears, the diff seems wider than a normal open diff. Kind of hard to see with the spare tire in the way. Well drop that tomorrow for a better view.

Well the Casting brand numbers didn't cross reference correctly, screw em. Seems like members are limited on edits, which keeps folks honest, I do like that. Centric was used for the MC, and Raybestos for pretty much everything else. Admittedly I would have used Centric throughout, but they are hard to find locally(I think the nearest shop that sells to the public is in Vallejo).

Just finished up on the rear drum rebuild. New '68 Fleetwood 1" WCs and the rest was Raybestos replacement parts for the '70 GMC 2500. I dunno why but this was one of the quickest/simplest drum brakes redux done. Maybe it was due to the lack of an axle flange being in the way.

Pro Tip: When doing the drums on these models start with reinstalling the rear shoe. That has the E/P brake attachment and anchor linkage attached to it. Also pop off the C/E clip from teh P/B attachement, don't fight the PB cable on removal/reinstall. The front shoe pretty much installs itself.

The floater rearend is getting a bit of a redux itself. D side oil seal was blown and that rear shoe basically did nothing. The right rear was constantly locking up under hard braking or in the wet. "1/4 turn the steering to the left if you have to get on the binders" should not be told to someone borrowing a truck.
As for floater rear ends. EVERY LIVE AXLE VEHICLE SHOULD BE ONE. I was somewhat dreading the experience but damn it makes everything easier. That C-clip garbage is for the birds.

A few last minute issues that need to be addressed with the front brake lines and the truck should be ready for brake testing.
I'm fairly sure an adjustable prop valve will be added, but we both want to see what it will do before hand.