Help with preload for a ladder bar/coil over car

[Hacksaw]

Check that the rear is square in the car, measure circumference of slicks and compare.

[Mike Rietow]

That's really not unusual OP, the rotation of the rear-end on low hp cars controls the dynamics of the chassis. A little pre-load takes care of that, but pre-load is a last resort. There's other avenue's besides pre-load depending on what we're working with. Do you have double adjustable coil-over shocks on the back of the car? What kind? How many clicks of adjustment?

Do you have double adjustable struts/shocks on the front? or single? or no adjustment up front?

[Mark Ugrich]

If it’s only on occasion , are both tires getting an equal burnout and heat? Out of groove like previously mentioned would make sense too.

[Mike Rietow]

If the rear of the car has a tendency to go right on the burnout. it's wearing the left rear tire. If this is the case, this can be taken cleaned up with a shock adjustment, if we have D/A shocks in play on the car.