As some of you saw when I posted pictures, I have recently installed a 6" lift on my crew cab. I drove it on the interstate for the first time this weekend and now it has a small vibration around 65~70 mph. It's not bad but I want to fix it. The lift is a Rough Country 6" kit with the rear lift consisting of a 4" tapered block and an add-a-leaf. My truck has a 2 piece driveshaft so the usual t-case drop or cv joint add on wont work. Any ideas?