If you go to an open drive line axle you need to provide some way to limit axle windup as the original axle is mounted to the springs with bushings such that the axle can change angle relative to the spring.
1951 3800 1-ton "Earning its keep from the get-go" In the DITY Gallery 1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
