74 power wagon dream truck...

So I take it the Chevy 3/4 ton is a Dana 44 and that's why the disc mounting plates fit right on the dodge?..
Yes exactly, Chevy and Dodge used the Dana 44, of course they spec it out a little different for each manufacturer, so there is small differences, but most parts interchange. (Inner/outer axle shafts, u joints, bearings, races, seals, ball joints, gears, all the same)

now Chevy for some reason in the later years (I guess to save money?) made there own front axle designed off of the Dana 44, which was called the Chevy 10 Bolt axle, everything off those interchange as well. So parts are everywhere for the Dana 44.

Ford used ‘em too.