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Sorry guy but you're off. Linear rate springs (as are used) are the same rate through their entire stroke. So if the spring is compressed an inch, the rate to continue compression remains the same. This is a mathematical function of linear rate. A progressive rate spring will have an exponential...

Compressing the spring does not increase the spring rate, so no, the ride does not get stiffer in this due to preload. Increasing spring rate moving from a 400 to 500 lbs spring will absolutely stiffen the ride. Where ride quality deteriorates on a lift is in the loss of down (droop) travel...