Well sometimes you just get lucky!!! I checked Craiglist late last night after watching the BSU football game and found the top ad in auto parts was a 69 Gm 12 bolt truck in 3.07 ratio. WOW@
I hated to call that late but the ad was posted just 10 minutes previous, And I picked it up this morning!!!
Is complete from drum to drum from a 80,000 mile truck from Baker City Oregon.
It is correct width and 6 lug. Gears are good and oil is clean with no metal suprises in the bottom of the case.The only difference is the panhard bar attachment is on the case instead of offset on the tube as was 64 style. I have a extra 72 panhard bar that should fit.
It was meant for a 65 C-10 racetruck project but plans changed to a posi.