[Greg Reimer 7376]

I swapped in a 12 bolt into my red 62 Impala SS back in 1976 with no problems. It originally was from a 69 El Camino, so ALL 68-72 A body 12 bolts will work.As I recall, the back spacing was not an issue,backing plate to backing plate,I used 4.56 gears,nothing trick here, a 4 series posi unit and stock axles.The 65-70 Impala unit was about three inches wider and would have to be narrowed.The 65-up lower control arm brackets could be removed from the 62 housing and welded to the 12 bolt axle tubes. I think that the brake backing plates might interchange from the 62 rear end to the 65,therefore your disc brake stuff would carry over to it. The upper arm attachment points on the 65 impala 12 bolt might have to be moved a bit to line things up, and some kind of custom length Panhard rod would have to be built-no big deal. In order to put the stock width Chevelle A body rear end in, the 62 lower arm brackets would have to be swapped for the Chevelle arm brackets then some kind of custom upper trailing arms would have to be made to connect the upper arm front mounting point to the Chevelle upper bushings. NHRA rulebook says that the rear upper arm mounting point CAN be relocated. Wonder if they thought of these cars when they made that rule!One thing,though- A body cars had 9 1/2" dia.rear brakes-also,the flange for the backing plate was smaller as they had a smaller diameter axle than the big car 12 bolts.One thing for certain-the 12 bolt is the way to go with these cars,there's no shortage of good parts out there for them.