I've got a Eaton 10 bolt that is in my '62 that IS a posi. The 12 bolts I believe were in the GMC's if I remember correctly.

I think it was 1960 GMC startd (don't quote me on this lol), but you can use up to 1970 ('70 last year for 6 lug truck rearends), but you'll have to relocate the mounts on the rearend so it can bolt up to the trailing arms on your '62.
there is an aftermarket kit for this.
David


My truck don't leak oil, it just marks its teritory.