[George C]

One way to experiment with centre drop is to mount your axles to small plates bolted to the chassis rather than direct to the chassis. Make an over size hole in the chassis to allow for vertical axle movement and then make up plates with different amounts of drop on the same bolt pattern. These go over the holes through the chassis. It's a good idea to label the plates with the amount of drop. You'll need them in sets of 4 - two for each axle. It doesn't have to be the centre axle that gets dropped. Raising one pair (either front or rear) of the outer axles does pretty much the same thing and can be easier - particularly if you're using direct drive. We didn't need them this past season put have made them in increments of 1/16 in the past.