I installed the RC 4" stage two, lift and running 315x75x16 it handles and goes fine only issue is I have a vibration at about 70 mph to 75 mph. I have stock drive shafts at the moment, would this be my issue or should I be looking somewhere else. I had it aligned and everything checked out fine, my wheels are steel procomp and did use a fair amount of weight to equal out on a couple of tires. Looking for some info. thanks

 

I just got finished doine a 4" long arm Tera. No vibrations That I've noticed yet. BUt I need to get it fully aligned I got the front tow done today. I am going to get the pinion angle set etc. But that is to just maintain my sanity Maybe you have something loose? But I would highly recommend checking into what your pinion angle is on your stock driveshafts. Chances are they will break or get into a bind if/when you go 4x4ing. They aren't long enough and the angle usually causes the universal joints to rub/bind. I hope that helps some.