On my 67 Barracuda I was able to rebuild the stock born-with springs, install new poly bushings leaving the hangers and shackles stock. I installed a 73 8 1/4 a body rear axle and was able to fit a 15" rally wheel 8" wide with 4 1/8" backspace and 275-60's with no problems. Really fills up the wheel well though--------------------:)
