Over the weekend I installed a 2.5" Rough Country suspension lift. The lift included new coils and shocks. Pretty easy install, (minus the 2 hour delay I had to spend re-tapping the thread for one of the rear shock mounts because I sheared off one of the bolts while trying to remove the old shocks.) But other than that a pretty staright forward install and not too difficult. I am really pleased with this set up and I am replacing the stock tires next weekend for a set ocf 31x10.5x15 BFG A/T's. The only thing I have noticed is a decent amount of vibration accelerating from 2nd to 3rd gear around 2500-3000 rpms. I'm wondering what is causing this, could it be the angle the drive shaft is at after the 2.5" lift? I thought I wouldn't have any problems with a lift under 3". Anyone else ever experience this?