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I "measured" my stock spring rates by first jacking up the right front wheel and then the right rear wheel to unload them of the car weight and measuring the drops in the height of the fender lips when the car was lowered. The front dropped 2-1/2 inches and the rear 2 inches. Assuming that the car weighs 2400 lbs and each corner supports 600 lbs, the spring rates would be 240 lbs/in for the front coils, and 300 lbs/in for the rear springs. The springs are located between the tires and the pivots for the suspension arms, so the actual rates are much higher, maybe up to twice(?). I know, totally ballpark numbers, but at least it gave me something to work from toward softening the ride.
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