Alright, here's the rear end facts - new ujoints, motor and transmission mounts, center bearing and hanger, a balanced and properly phased driveshaft, new coil springs, shocks, and bushings all around - urethanes in the torque rods.

Rides great, but I am getting a vibration, kind of a low rumble, at 30 mph or so. Feels like the driveshaft, but it is tight, and the vibration goes away above and below 30 mph.

Any ideas?

Thanks as always. You guys have rebuilt my car!