I thought I could feel my wheels vibrating after hitting bad spots. I bought KYB Gas A Just through autoanything.com . I knew I could not put on the front ones and had that done for $150. I wanted to save $100 and do the back ones myself. Ram puts the upper nut in a place where no socket or normal wrench can get easily. I had to use an open end wrench at an angle all while not being able to see it. It was hell. Done now and the truck feels like new at 45,000 miles.