Originally Posted by
Steve Demeter
I know of no magic formula. Put the car up on stands. remove the shocks. Measure the length required at full droop. Subtract length to get whatever droop you want to limit it to. Raise the suspension by using a jack under the upright til you get to what you thing the maximum bump displacement will be and measure again. Then use your best judgement to determine a final length. Obviously on most cars you will not need to go til the suspension binds in bump. YMMV but this has never failed me