WedgeOmatic, excellant diagram and chart. Pretty much what I said on my post, and on the 10 or so other times I have posted on this. They call "working angle" what I call "u-joint" angle, but the result is the same. The chart is a touch more aggressive than I posted, but I certainly wouldn't argue with it. I also shoot for an absolute max of 10* on any "working angle", so on leaf spring cars that have high angles I will limit spring wrap-up with Cal-Tracs, slappers, etc. Good work on the chart, and Merry Christmas!