I had minor rear driveshaft vibration because of the big lift. I recently added 6degree shims. this caused the pinion to be closer to the tcase. after measuring i sent the driveshaft to be cut down by an inch and a half. it was cut, rebalanced and sent back. I installed it and it fit like a glove. PERFECT. but now the vibration got 3x worse. and its freekin loud. U joints are good too. will a cv joint help? Ive heard that a cv joint in the rear tends to create a whippin effect because of the angle. could this be true? whats my problem or solution?