I have begun the process of rebuilding (or having it rebuilt) my Dana 45 3.92 traction lok differential that's under our '58 Apache (shortbed Fleetside, big window, 4 speed).

Here's a photo of the differential:
www.stovebolt.com

So far, I've contacted Randy's Ring & Pinion, but they do not have a line on the components to rebuild the posi unit.
I'm not giving up so easy! I will keep looking for parts; I will also begin looking for a shop with a lot of history that may be able to rebuild the unit if I can't find the parts.

I will keep you posted.

Tim