Steve,
Rear springs are soft, I had the softest rears for a monte on it and then went a little softer with a spacer. I wish I could tell you what the rate is, they are red and I got them from Crazy Davey. I am amazed how much it squats down on the rear. I check the shock travel after every pass, I get about 4 1/2 inches of downward travel on launch.