Another question... My truck has a 4" or 6" trailmaster lift. It was on the truck when I bought it so I am not sure exactly how tall. It does fit 35" tires easily and has never rubbed anywhere. I am thinking it is 6". The truck has had a bad driveline vibration since I bought it. I have had the tranfer case rebuilt, all new driveshafts built and balanced, new slip yoke, shimmed the rear axle, and it still has a vibration above around 60 mph. Sucks to drive on highway because of this. I saw an ad for a slip yoke w/ cv joint in a wheeling magazine. It did help when I shimmed the rear axle. I was thinking about trying a few more degree shim. I have the carpet out of the truck with line-x sprayed in interior so all road noise and vibrations are noticed. Help?