Dana 44 rear parts sources? 1962 GMC - posi, axles, bearings, drums, etc?

[Chuck78]

I've got a 62 GMC 1000 Panel, and am hoping to find a good source and good part #'s for the Dana 44 rear. Most parts databases confuse the chevy rears with the GMC models, so I don't know what to trust.

I think these have the coarse spline, but I'm looking to maybe upgrade to a posi and maybe get rid of the 3.07 for a 3.23-3.42. Not sure. Swapping in a 5 speed tremec. What I really want to do is find parts sources for the axles, brake drums, brake parts, bearings and seals, etc. I'd love to swap out a 30 spline posi if I could find one that would fit and off the shelf axles from somewhere in the right width and diameter. I have heard that the carrier bearings in these GMC rears were different than a standard (newer) Dana 44, and that parts are hard to come by.
I want to swap to 5 lug, but figured I'd probably have to redrill the axle flanges and drums. Want to make sure about parts availability before going that far.

Thanks,

Chuck in Ohio