kiddart1, I don't know if someone tried to answer your fatigue question or not. I am curious about all this as my car is very heavy and too nice to cut up. Want cal tracs set up and may go that way still, but originally they told me I would need to change the leafs every 2,000 miles in a car as heavy as mine(4260). Maybe I'll just twist up another set of SS. (Both front and rear segments are reversed in 2 seasons.) Not wanting to go big budget since I'm now building an A body to go faster and eliminate weight headaches. No budget for 2 race cars as one is tough enough. Wish someone could just tell me what to do but I will start with weighing front and rear weights to see if caltracs will even work for me.