I have an 06' F-350 with an 8" RIZE kit on the front. After a camping trip in the dez, where my wife and son did some cruzing around, I started getting a vibration at highway speeds like a u-joint was going out. So I replaced all the u-joints in the rear. Still have the vibration. I am begining to wonder if it isn't the front. Has anyone with a 8" lift ever had any issues with the front driveline needing to be extended? I am wondering if it didn't slip out just far enough and then go back together after skipping a couple of splines. I just recently found my jeep did the exact same thing. I haven't had time to pull it out and check so I don't know if thats it or not. Just fishing for a little insight before I do.