I rode in my son-in-law's fiberglass 32 with coilover rear suspension this Thanksgiving weekend. Man, what a rough ride! The TCI All American progressive coilover is what he is usingT because they were FREE. I can understand this, but I think he can get a better ride with just a spring change. Can someone give him a spring rate that they think would be a good ballpark figure. The car has been scaled and has a rear corner weight of approximately 650 pounds with him in it. I think the progressive spring that is on it is rated at 250# on the high end. This broken down old man isn't getting back in it until he does something different. Any suggestions would be greatly appreciated. Thanks