I'm thinking if You lower the front end and keep the rear at stock ht. You'll be increasing the caster silghtly not decreasing because the truck is angled down from back to front.
Pete
The positive caster that an AD truck has means that the kingpins lean backwards slightly when they're viewed from the side of the truck, so dropping the front end would make them slightly more upright and so reduce the positive caster slightly. The amount of reduction will be about 3/4 of a degree for 1 1/2" of front drop.
Stuart.
