A friend had a 70 Formula 400 4spd with the 12 bolt original equip.Back in early 70's there was a rumor GM Pontiac (canadian)made a 10 bolt with 12 bolt innards never could confirm.My SD doesn't have a 12 bolt and 2 others I know of don't.A 71 TA I worked on in 75 didn't have the 12 bolt.
|