[Morris]

Mike

When you start trying to push 700-800 Hp thru to the rear tires the upper control arm will come into play moving the car in a forward and aft drive.

So the side force along with the forward bite will put a strain on the upper control arm........ and the issue is flexing of the upper control arm..... which would change the geo of the rear suspension.... even thought bent control arms are used to get around frames and other componets ...... the line is still theoretically straight ...but the arm is going to bend more or less .....as opposed to a straight arm.....

And yes the .015"thousands per inch is max allow and if you can get it better it's always desired.

You are right on the mark with the rear end getting loose on you when hitting the brakes at the end of a straight .....as the geometry moves from a Toe-in condition to a Toe-out condition which is a wandering condition......

Toe-in is what you want on the rear end ..... you want the car to track like it should and not go from a Toe-in to toe-out and back condition as the back end will move around from side to side......and this has been a issue with these cars since they were made...... Many folks will set so much toe-in so they don't go into toe-out and then they have just scrubbed alot of speed.

Unstable suspension geometery will cause many ill-effects to the handling of a chassis.

Morris