I am a terminally stubborn old fart. I understood what was required to adjust pinion angle and I already put adjustable control arms on my rig. Stubbornly, I again and again tried to eyeball the angle, only to end up with a ride that would make Xaviera Hollander grin ear to ear while soaking the seat. Today I finally crawled under there with an angle protractor and set the bitch up according to instructions everyone here has seen repeatedly. Surprise of all surprises, only took minutes to do and vibration is gone. If you can add or subtract using moronically simple math (no fuzzy math required), you can set your angle right the first time every time. Doing it right IS the shortcut. Smooth as silk.