The Stovebolt Site Forums The Shop Area Driveline Pinion angle

One other thing that should be mentioned. The GM engineers had less concern about bias in the AD springs than they had in the later applications because with the torque tube, differential rotation couldn't happen. Their concern about spring bias would have been limited to (a) ride quality (b) cornering and safety concerns.

My point in mentioning this: installing an open driveshaft rear end will relocate and alter things. The original springs were designed with an offset center pin and a different system of downward weight distribution. To me it comes down to common sense...the further back you slide the rear end the more you alter how the springs are going to work...especially the way they're pinned together. Further back...stiffer. Hope this makes sense.