Mopar SS leaf springs

some friends were using stock spring set up on a 64 Savoy wagon with a Max wedge running in stock eliminator and it always pulled one wheel a lot higher than the other. They installed a complete Cal Tracs system and the car launched absolutely flat, and when they got it back to the shop the pinion was sticking way up in the air. Careful inspection showed the spiral cracks in the rear housing paint where the better hook up had twisted both axle tubes:lol:. Can you say Dana?