I am not sure what spring rates were on mine. The manual calls out for 400 or 500# springs on the front. When I got mine it has a motorcycle type rear shock that rode terrible. It had a front sway bar that I took off. I took all the shocks off and replaced with new double adjustable QA1’a DD401’s with those I had to reduce spring rates a lot. I ended up with 220# rear, and 300# front. The fronts fit fine just installing upside down. The rears I had to install upside down and move to the inside of the upper mount to clear the driveshafts.