I have CalTracs and split mono leaf springs on my avatar car. Unless there is water at the starting line, the car lifts and leaves. I have bias slicks. Great axle separation - whole car rises and leaves. 408 with a 4.10 axle and a TC that stalls at 5000 rpm. I have only good to say about them but my car is middle of the road in terms of performance. Faster than some, slower than others: [email protected] best so far.