I am currently running about 3" of lift in the front, with 3 degree caster correction bushings. At first I had only a slight vibration on deceleration, but it grew worse with time. I pulled my front driveshaft and the u joints look and feel good. I am trying to decide whether to replace them anyway and see if it helps with the vibe, or just bypass the whole step and do Landtanks caster plates with a DC shaft. What is the way to measure pinion and t case angles in order to see if the stock shaft has any chance of running vibe free with the current set up?