for everybody that is using offset shackles

What's your opine on shimming the front hangars,as per the Mopar chassis book(per drag strip specs,not road racing) Just curious,on your thoughts,72 (002/003 springs...)

You mean shimming between the frame and the hanger to correct the thrust angle right? Those are used in all kinds of applications, not just drag racing. Hotchkis sells shims with its springs to correct thrust angle,



Description:
Hotchkis Sport Suspension has developed a Thrust Alignment kit for use with our leaf spring kits, or factory springs and hangers. The process is very simple and involves inserting the necessary shims between the leaf hanger and the body. (See Image Below). The kit consists of six (1/32") shims and allows for proper thrust alignment of the rear end.

But I'm not a drag racer, and I know that the SS springs have different arches and spring rates. The only thing about that is the thrust angle might tend to change a bit when you're under load, like launching the car, so the static thrust angle and the dynamic thrust angle might not be the same thing. In that particular case, I don't know that you'd always want to correct the static thrust angle, since you might care more about what it's doing at launch. Maybe someone that knows their SS springs or drag racing better than I do can comment. But typically, yes, you'd want to use the shims to correct the thrust angle of the rear.