Diff drops are useless IMHO. Go measure the difference in the CV's with a diff drop and one without it, it's almost negligible. A diff drop (should be called a rotation) only tilts the front section of the diff down, the rear part of the diff is still in it's original position. So a perceived 1" drop is actually less then 0.5" and when you divide that by the 2 CV joints it is actually less the 0.25" of correction at each CV. Hitting a bump in the road, turning, your steering wheel, etc... creates more change in the CV then that. Some will say "well I'd rather be safe then sorry" but that comment is not entirely accurate either. Reason?, well when you rotate the front of your diff down you add stress to the pinion angle of the front diff just creating another area of possible concern. Not to mention they lower your ground clearance, make mounting skid plates more difficult.