There is a bolt near rear of torsion bar (the end closer to rear bumper) which will increase or decrease the tension on torsion bar when you adjust bolt.
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Towards the rear of the torsion bar is a large bolt head. Simply turn it clockwise to raise the truck, counter clockwise to lower it.
as the rear is torsion it is not straight forward. the torsion bars have to be removed one side at a time, with the torsion bar out simply adjust hub the required amount and replace torsion bar. then do the other side. this can be hard as the bars can be difficult to remove. best left to professional should cost between £60-£100
Under vehicle by end of torsion bar (side closer to rear of vehicle) there should be a 6-point bolt which when tightened or loosened will apply more or less tension to torsion bar.
You remove the metal retaining clips on the back side of the frame / cross member that stop the torsion bar from sliding out. Figure out a way to clamp something to the torsion bar and smack it with a hammer driving the torsion bar towards the rear of the car. PS they do sell tools made to clamp on to the torsion bar. I would also suggest having the wheels off the ground and hanging. Also loosen the nut that adjust the ride height.
May have control issues
The 1st generation Nissan Pathfinder, 1987 - 1995 had a torsion bar suspension on the front end of the vehicle. There is a driver's side and passenger's side torsion bar and they are not interchangeable. 1996 - 2009 models do not use a torsion bar.
Front is torsion bar and rear is leaf spring. Both front and rear have anti-sway bars http://en.wikipedia.org/wiki/RPO_ZR2
You need a torsion key.. most mechanics can twist the bar for cheap
A torsion bar is used in an auto suspension. A torsion bar suspension, also known as a torsion spring suspension or torsion beam suspension, is a general term for any vehicle suspension that uses a torsion bar as its main weight bearing spring. One end of a long metal bar is attached firmly to the vehicle chassis; the opposite end terminates in a lever, the torsion key, mounted perpendicular to the bar, that is attached to a suspension arm, a spindle, or the axle. Vertical motion of the wheel causes the bar to twist around its axis and is resisted by the bar's torsion resistance. The effective spring rate of the bar is determined by its length, cross section, shape, material, and manufacturing process.
the torsion bar is actually a rod which is twisted when load is applied on opposite direction like couple