Usage
Torsion bar suspensions are used on combat vehicles or tanks like the T-72, Leopard 1, Leopard 2 and Abrams (many tanks from late in World War II used this suspension), and on trucks and SUVs from Ford, Dodge, GM, Mitsubishi, Mazda, Nissan, Isuzu and Toyota. Manufacturers change the torsion bar or key to adjust the ride height, usually to compensate for heavier or lighter engines. While the ride height may be adjusted by turning the adjuster bolts on the stock torsion key, rotating the stock key too far can bend the adjusting bolt and (more importantly) place the shock piston outside its standard travel. Over-rotating the torsion bars can also cause the suspension to hit the bump-stop prematurely, causing a harsh ride. Aftermarket forged-metal torsion key kits use relocked adjuster keys to prevent over-rotation, and shock brackets to keep the piston travel in the stock range.
Read more about this topic: Torsion Bar Suspension
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