Not sure what the spring rate is. I looked on their website and found nothing. Have to see if there is anything with the paper work that came with them. I had read that if you went from mono leaf to multi leaf you had to use shock extenders but the shocks seemed to fit fine without them.
I have only been able to put a few miles on it. It went from the rear end shop to paint and Just got it back Wed. from having a new interior installed. Today is the first day I have had a chance to get out to the shop. I will check to see if I can tell where it is hitting and if shocks seem to long. Thanks