We put new Heavy Duty leaf springs on our chally and after we finished the resto, we realized the back was sitting too low and the tires were rubbing on big bumps. So we turned our QA1 shocks to their stiffest position to see if that would solve the problem...now THAT is a stiff ride! But, it didn't stop the problem. We finally decided (right before Carlisle) to put the air shocks back on there and that did get us a couple of inches (we only needed about 1 inch). In the end we figured the air shocks were the cheap fix, but not necessarily the right fix. So, we ordered super stock springs and will get them put on this week.