phunk, I agree with you, the difference in grip has come from the changed link arm lengths and the way load is supplied to the diff , the neg. pinion angle is unwanted but thats what works best on drag cars, speedway cars and rally cars.

It is another option to cut off link arm mounts and rotate the diff to a desired degree and weld them back on, in my eyes its a painful way of experimenting though, after the initial time it takes to make the adjustable arms it takes less than five minutes to adjust the angle.