Death Wobble: Causes And Cures

Track Bar: Death wobble can often times be traced back to the track bar. Improper installation, loose bolts, wallowed out bracket holes, worn bushings, or broken welds can all be contributing factors. The track bar’s job is to locate the axle under the frame. Because one end attaches to the frame and the opposite end to the axle, the track bar takes significant loads as it cycles with the suspension and resists steering inputs. Once any of its associated components have been compromised, it can transfer vibrations and start oscillations that can become death wobble. An adjustable track bar with OE-style bushings, such as this unit from JKS (www.jksmfg.com), is a smart upgrade after a lift and will ensure the axle can be perfectly centered under the frame.

Track Bar: Death wobble can often times be traced back to the track bar. Improper install

A controversial and highly debated topic in the 4x4 world is the subject of death wobble. Death wobble is a blanket term that is often used to describe a series of sudden and violent frontend vibrations exhibited by some solid axle suspensions. If you have it, there is no mistaking what it is. Death wobble, if ignored, can lead to serious damage to other components and even loss of vehicle control.

It is important to understand that there is no one problem that causes death wobble, but rather any combination of things, such as tire balance, loose hardware, damaged components, bad alignment, and improper installation of parts. All of these things can conspire together and start a domino effect that could ultimately lead to death wobble. Solving death wobble can be a slow process of elimination. If you experience death wobble, let off the gas and let the vehicle slow on its own until the vibration is gone, then proceed carefully and immediately to a place where the vehicle can be inspected. Even just one death wobble incident, can cause permanent damage to your rig.

Once death wobble is suspected, the first order of business is to rule out the simple things. Look for clues that might tell you something is wrong, such as uneven tire wear or play in the steering wheel. Next, crawl under the front of the rig and check for any obvious loose bolts, fresh rust, and wallowed-out holes, especially on the track bar bracket. Here is a list of components that can lead to death wobble and should be checked.

Tie Rod: The tie rod connects the knuckles and transfers the steering input from the draglink to the wheels by way of the knuckles. The addition of bigger rolling stock can stress factory tie rods. Worn tie rod ends, which can present symptoms such as a shaking steering wheel, chassis vibrations, and wandering, should be replaced immediately. A good tie rod end should exhibit rotational movement at the joint end, but will not have any up and down or side-to-side play. Heavy-duty tie rods that are more resistant to loads from bigger tires are readily available in the aftermarket.
Tie Rod: The tie rod connects the knuckles and transfers the steering input from the drag
Drag Link: The drag link is the rod between your pitman arm and your knuckle and is what transfers your steering inputs from the steering box to the knuckle. You’ll want to check the drag link for any damage, such as bends, as well as the joints on each end. There shouldn’t be any up and down play in the joints. Heavy-duty draglinks with upgraded joints are available.
Drag Link: The drag link is the rod between your pitman arm and your knuckle and is what
Steering Stabilizer: While steering stabilizers can mask frontend issues and aren’t a “fix” for death wobble, they are still an important part of the steering system that should be checked periodically. A properly working and mounted stabilizer can absorb unwanted secondary vibrations that can lead to death wobble. Also note that not all steering stabilizers in the aftermarket are created equal. Some companies sell shocks designed to mount in the vertical position as a steering stabilizer that gets mounted in the horizontal position. The problem with this arrangement is that some of these shocks, when horizontally mounted, can experience a change in resistance through the stroke. A good steering stabilizer has linear resistance throughout the entire stroke and won’t change based on the shock’s mounted position.
Steering Stabilizer: While steering stabilizers can mask frontend issues and aren’t a “f

Control Arm and Leaf-Spring Bushings: Whether you have stock rubber bushings or aftermarket spherical bushings, they should be inspected regularly for any wear or damage that allows unnecessary movement in the control arm or leaf pack. Occasionally, rubber control arm bushings can be damaged during the installation of a lift or from tearing or binding as a result of extreme articulation that they weren’t designed for. Leaf springs can also suffer from loose or damaged U-bolts, allowing the axle to move around under the chassis on its own.
Control Arm and Leaf-Spring Bushings: Whether you have stock rubber bushings or aftermar
Steering Box: After chasing all of the usual death wobble suspects to no avail, sometimes you’ll discover the issue is in the steering box. Worn internals can cause slop in the steering and a bent or twisted sector shaft can increase steering effort and limit the range of steering.
Steering Box: After chasing all of the usual death wobble suspects to no avail, sometime
Ball Joints and Kingpins: Ball joints and kingpins are critical components to any steering and suspension system, as they are the pivot between the steering knuckles and the suspension of a vehicle. When ball joints go bad or kingpins wear, they can cause unwanted movement from the wheels and tires, transferring vibration to the chassis. Factory “sealed for life” ball joints are often already marginal with the biggest wheel and tire package offered from the factory. Adding even larger wheels and tires, as well as the increased weight that comes with them, can easily exceed factory ball joint design limits and increase wear, potentially leading to catastrophic failure. We recommend greaseable, heavy-duty ball joints, such as the Dynatrac (www.dynatrac.com) ProSteer ball joints seen here (left). In addition to being greaseable, these joints can be rebuilt without removing them from the vehicle.
Ball Joints and Kingpins: Ball joints and kingpins are critical components to any steeri

Wheel/Unit Bearings: Wheel bearings both support the load of the vehicle and allow the wheels to turn. Worn bearings can exhibit side-to-side play, vibration, noise, and have an affect on steering. On older vehicles with serviceable wheel bearings, it is important to make sure they are adjusted and properly greased at regular intervals. Vehicles with unit bearings that exhibit signs of excessive wear should be checked and replaced if necessary.
Wheel/Unit Bearings: Wheel bearings both support the load of the vehicle and allow the w
Alignment: Finally, with all of your parts inspected and anything worn out replaced, you should make sure the vehicle is aligned properly before hitting the road. Having enough caster, or the amount of angle in the steering pivot, is a critical element in managing death wobble. However, you may find out that good caster comes at the expense of pinion angle, which could set up a separate vibration issue. Proper tire balance is also important when trying to keep death wobble at bay. fw
Alignment: Finally, with all of your parts inspected and anything worn out replaced, you