I just installed a set of Brown Dog 1" MML on my YJ last week. Def more vibrations but it allowed me to get rid of my xfer case drop. I just notice the vibration a little more b/c the mounts are beefy and they use poly bushings. These are very beefy mounts and high quality. I had one question when I was installing them, I called up, they answered on the second ring and I got an answer right away. Thats customer service. Also a tip, have about 1/2" thick of washers that fit on the MM bolt, you need to shim the passenger side. Also they say in the instructions that you need to take off the drivers side MM bracket and grind it a little to get the bushing to fit. I could not get some of the bolts out so I just took off about 1/4" to 1/2" if the bushing for the drivers side to get it to fit. Second to last tip, soak everything in PB Blaster. Ok last tip, on the passenger side MM the MM sits on another mount that is then bolted to the frame. You need to reuse that bottom mount.