Thank you for your help. I did order the rear springs from LMC. I do not plan to carry any cargo in the back. I am more concerned about the capacity of the front springs because of the extra weight of the V8 engine and 350 turbo tranny. I am also having a negative caster problem now and I'm hoping to solve this problem with 2 degree caster shims and new springs. I want to make sure I don't get excessive spring sagging in the front. LMC wants $260 for each front spring, which is a lot more than other vendors, but I don't know if the capacity is more. The original Chevy springs specs say "Load in pounds at opening height is 810 to 890 at 1/2" and "Capacity at ground is 1000 pounds". I am not sure what this means. The SD springs specs say their capacity is 850 pounds. I don't know how this relates to the Chevy specs. The specs I am referring to are at
http://chevy.oldcarmanualproject.com/chevyresto/52129.html
