I bought a 98 sport and it feels like i'm rising on ice when I increase the spead. It's sitting on 35's mud crawlers and 6inches of lift. The tire pressure and everything checks out. There is two metal arms extending towards front wheels with 4 holes lined up and a pivot arm attached to the hole closest to the tire. If I adjust the arms towards the front holes will that make the ride more smoother. First time owning a jeep thats lifted.
If you find that it pulls one direction when you accelerate and the other direction when you decelerate, you might want to crawl under it and check the control arm bushings for wear, particularly the rear control arm bushings. Also check to make sure that all the bolts and nuts on the suspension are tight.
Check the rear sway bar links, if they are aftermarket and extended switch them back to stock. I have lifted 2TJs and an LJ, on all 3 the Jeeps wandered all over the road with the extended links, which vanished with the stock links replaced.