I finished lowering the rear end of Cleetus by doing a front hanger flip. The end result is exactly what I was expecting: 1" of air before the axle hits the bump stop .
I took it for a shakedown run to HD, happy to show off the new, free, lowness. Amazingly, the long wheelbase made the ride relatively smooth, even over bumps. I'm quite pleased with the end result. However, I never made it more than a quarter mile...
In dropping the rear end, I didn't bother loosening the u-bolts to shim the driveline angle a few degrees, as recommended. Well...under engine load, there is a noticeable drumming coming up from the chassis. When still in gear and the gas is let off, it still produces vibrations. Its only when the clutch is taken in that the drumming goes away.
Fortunately, there is no damage...but I've grown wiser enough to do a u-turn and live another day. I'll figure out what's up tomorrow...