Thanks for the opinion on the splines Bill, trying to dig the info from the parts books is next to impossible, it just muddys up the water that much more. Man this is confusing, so your saying that the 3/4 ton rear end in mine is an Eaton, something????? And would all the Eaton, “something” center sections interchange??? That seems to indicate to me that there would be a fairly large selection of center sections available for the 3/4 ton AD. All this time I’ve been lead to believe that the ONLY center section that will interchange with mine and fit my housing without modification was the 67-72 3/4 ton Suburban, and I believe that the indications were that it had to be an automatic also.
Well this is more fuel to add to the fire that’s raging round my rear end! And I taint talking about Mexican food here!
I wish we could get a whole bunch of first hand experience in one thread that could put this “fire” out, once and for all. All of the junkyard I go to round here just give me a blank stare when I start asking these questions.

boy I just can't picture what you guys are talking about, "drums mounted inboard of the wheel mounting flange", how in the world do you do that???
Denny Graham
Sandwich, IL

Denny G
Sandwich, IL