I live a few minutes from the 318 curves of the "Tail of the Dragon", Hwy. 129 @ Deals Gap in E. TN which I drive often. Since a lower center of gravity helps handling, a Belltech axle-flip kit was installed which lowers my Ranger 2" front and 4" rear. The kit fit just fine but created very annoying vibrations from 15-35 MPH due to excessive pinion-up angle. So, I got an angle-measuring app for my iPhone and measured the tranny and pinion angles (they should be very close to parallel for minimal vibes). The pinion had gained 6 degrees up-angle from lowering so I ordered Belltech 6 degree spacers and installed them between the axle and springs which corrected the angle and eliminated the vibes. The Ranger rides smoothly now and handles much better...! I am so happy with the results that I ordered a Livernois ECU tune.
Cheers from the Smoky Mountains.
Before:
After:
On the Dragon:
On the Dragon:
On the Dragon:

Cheers from the Smoky Mountains.
Before:
After:
On the Dragon:
On the Dragon:
On the Dragon: