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actually, the best spring to match a 300 up front would be a 500. these cars like to be just a bit softer in the rear than the front (generally about 10%). that's what i had been running for years until a few months ago when i went to a stacked spring setup.
as for length, it also depends on the shock, due to the thread length and such. on the QA-1s i am running, i have an 8" spring but had to use a 2" spacer to clear the upper plates and make up the difference. i have since replaced that spacer with a tender spring to give me a lower initial rate yet maintain the final rate.
regarding ride quality, it all depends on the shock. koni yellows, for example, won't ride well at that rate, and bilstein escorts will really suck. koni double adjustable hydraulic struts however, coupled with QA-1 shocks modified like mine, are pretty smooth with a linear spring, and extremely smooth with a stacked spring.
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