How much angle you run depends on how much axle wrap you will have. Leaf spring cars obviously have more than 4 link cars, etc. That being said, I run a Caltrac system ( including their single leafs ) and you can run enough preload to just about eliminate axle wrap. Mounted my camera under the car on a few runs to prove this. I usually run zero preload and at that setting there is some wrap. I usually run 3 down at that setting. Still a guess - I guess. Aint had the driveshaft roll out from under the car yet Some times 4 or more down will give you some interesting vibs on heavy decell.