My first suggestion would be to get the wheels balanced. When that is determined to be okay, check that the track bar bolts are secure. Then check the front alignment. If you've been offroading, make sure your tie rod is not bent, which will throw off your alignment.
The wheels may not have been centered on the hub correctly during re-installation. Try removing the wheels and tightening the lugs with the wheels off the ground in a star pattern. have somebody press the brake while this is done to prevent the wheels from turning.
This can happen with wheel spacers or non-hubcentric wheels.
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