Originally Posted by C&B RC

Steps:

1) measure your shocks: rears should be the same, Fronts should be the same. Fronts & rears don't have to be the same.

2) Set your ride hieght

3) Now measure your droop. Each chassis is different but this works for any chassis. Lift one end of the car just until the tires lift off the ground. Take this measurement and subtract the ride hieght. This is the droop. With the blocks and gauge and the tires off, check the left to the right they need to match, adjust with droop screws or internal shock spacers (old school)

Common tip: while holding your car with your tires hanging, rotate your springs, the shouldn't slop up and down (excess droop-no preload on springs) or the opposite, so tight your can't rotate them

Download the hudy setup station manual, it goes through the same thing and gives you the effect of raising & lowering droop