I have a 2005 jeep wrangler manual TJ I bought about a month ago. It has a rough country lift and aftermarket ironman tires. I had no issues driving backroads or highways when I first bought it and drove it daily to school and work on the highway; backroads on the weekends. My father is a mechanic and wanted to replace the wheel bearings because they had some wear when I purchased the jeep. After replacing them when brand-new wheel bearings my jeep will randomly swerve around on the highway after I get up to about 60 mph or faster. He has since then tried a few things to help: added maximum caster and toe in. checked all the bushings, aligned everything, and let some air out of the tires. While these things made it easier to manage on the highway, I still don't think I should give up on figuring out why it isn't driving how it did when I first bought it. I know sometimes the drop pitman arm can make a jeep wander as well but mine is stock. Any ideas or suggestions?