Hey there, I would love to get some advice on after market progressive rate springs for my 67 GT500 (420-680?). It appears that most of the manufacturers are out of business and would love some thoughts from this group.
K
Hello,
You may want to look at these.
https://opentrackerracing.com/product/progressive-rate-big-block-coil-springs-1967-1973-mustang/
Thanks,
Eric