Axle wrap is the deformation
of the leaf spring into an "S" shape caused by the rotation of the axle opposite
the torque created by accelerating. When power is applied, the pinion pivots upward,
and once this reaches a critical point the leaf spring starts to deform. This
unwanted movement allows the pinion angle to change and then the springs twist
and untwist rapidly, causing the rear to hop under power. This puts a lot of stress
on many driveline components such as u-joints, drive shafts, and yokes. The snap
back effect from axle wrap is commonly referred to as wheel hop, which causes
handling problems and can result in rolls in off-camber situations.
Axle
wrap is a major drive shaft breakage problem in lifted Jeeps and is one of the
major problems with using Spring-Over-Axle conversions. Spring-over axle setups
are far more prone to axle wrap than the standard set-up because they allow more
leverage for the axle to twist against the springs. Axle wrap is also increased
by the use of lift blocks and weakened or soft springs. Additional horsepower
and larger tires will also increase the problem potential for axle wrap.
One of the best ways to
deal with axle wrap is to use Warrior torque
bar systems. These torque bars keep the axle in place during speed changes,
which improves traction and direction stability in lifted Jeeps. By controlling
this movement they help eliminate axle wrap and, lessen shackle and driveshaft
problems during sudden acceleration changes.
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