Re: Junk yard rear differential interchange options.
You '72 12 bolt will have a WMS to WMS of 63.5". That is the same as the truck 12 bolts from '73-'82 and the truck 10 bolts from '79-'86 in the C series and '87-'91 in the R series trucks, Suburbans, etc.
I don't know what is wrong with the 12 bolt you currently have under your truck, but I would suggest rebuilding what you have. Sure you could find another differential to put under your truck, but who knows how long another used differential is going to last. And that is after you have welded on the trailing arm mounts and fabricated a panhard bar mount.
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