For the front end you can adjust the torsion bars by tightening or loosening the torsion bar key adjustment screws. It should be an 18mm hex head bolt. There should be a few inches of play overall; any further adjustment would require changing out the spindles or lowering blocks. l Since the rear end is traditional leaf springs there are a lot of accessories you can order to raise or lower it.
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The 1997 GMC Jimmy tension bar has adjustment nuts on both ends of the tension bar. Turn the adjustment nuts to lengthen or shorten the tension bar distance.
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