The 3link rear suspension introduced on the 2005 Mustang is missing a design feature which is desirable for the dragracer. I am referring to a form of asymmetry which would provide dynamic cancellation of the driveshaft torque. This would equalize the rear tire loading and thereby provide maximum tractive tire performance. Interference with the rear passenger footwell prevented an offset of the upper link, but there is yet a change which could bring the desired results.

This change would involve altering the brackets at the rear of the lower links in a manner which would provide a net couple dynamically sufficient to cancel driveshaft torque. Unfortunately, I don't have a 2005 Mustang from which I could obtain exact measurements, so the initial values in the spreadsheet are only approximations. If you are interested in such a change, you will have to supply more accurate numbers.

So, the changes dictated by the program's output would provide equal rear tire loading and no squat or rise on launch.

And, of course, the spreadsheet can be used for any similar arrangement.