Re: Vibration / Resonation from rear end.
Yes, you may have a slight binding in the u-joints after changing the geometry back there but the fact that you say it only does it at a certain RPM makes me think it's a bad u-joint or a driveshaft balance issue. Whenever you remove the driveshaft, you need to mark both ends to be sure you install it back in the same position it was before you took it out to ensure you don't get any funky vibrations. I'd bet on a u-joint/joints........
1992 Ford Bronco
E4OD- B&M Stage 2 shift kit
Full 3" stainless Bassani Exhaust
32" BFG's/stock suspension
"No replacement for displacement."
"Our lugnuts require more torque than most Honda's produce!"