I have the same issues my lift is also the rc long arm. I set up my gopro to video the front axle and I spent all my time watching the steering linkage, ball joints, tires, and track bar. Never thought to even pay any attention to my motor, it was shaking all over the place while everything was nice and steady. Soon as I get the cash I'm upgrading the motor mounts and hopefully it does the trick. At one point I did have DW and that's when I went to the long arm kit, and new track bar. For few months I had that jeep driving smooth as glass until I moved to Florida and hauled a trailer with everything I owned on it and after my journey was over and I removed the trailer, 55mph And up didn't feel soo safe anymore.