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Sloppy JK Steering? - Ball Joint Upgrades

Posted in How To on July 1, 2013
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It’s a well known fact now that the Jeep JK front axle ball joints can be problematic. Somewhere in the Jeep design process (or in the final accounting budget) it seems Jeep skimped on this part, leaving it vulnerable to premature wear and causing owner dissatisfaction.

The OEM upper and lower ball joints were designed with non-serviceable synthetic liners. The use of this material at this critical wear point has proven to create issues. Over time, dirt enters the joints, causing galling of the liners, and the joint develops play. This typically results in steering looseness, vibration, and track wander as the joints wear.

The joints have been found to wear out within and outside warrantee periods, even when running stock wheels and tires over moderate terrain. Lifetime results seem to vary widely. Of course, the addition of greater payloads, heavier wheels and tires, and rough use in the dirt will accelerate the wear even faster. This wear can also be accelerated with the addition of wider wheels that increase scrub radius and load on the ball joints.

Stock replacements can be installed, but the owner is still left with a non-greasable and marginal steering part that will again lead to issues as the joints wear. Today, there are several aftermarket solutions to rid your Jeep of the factory pieces and upgrade to parts that can take greater strain and will far outlast the stock ones. Swapping to one of the aftermarket alternatives helps avoid the loose steering response and potential death wobble, and tire wear will be better kept in check. Sure, they cost more up front, but in the long run you’ll have better wear resistance and will come out ahead in dollars saved from more frequent replacement of OEM-spec parts.

Here is a look at the internal components of the stock ball joints showing the non-serviceable and troublesome liners. When replacement is done, it’s usually best to replace top and bottom joints as a pair.

Steering wander, death wobble, poor road tracking, or suspension popping can all be signs of worn ball joints. However, these symptoms might also be due to other worn steering components or loose wheel bearings. To check a set of ball joints at one front tire, it’s best to jack the tire off the ground. With a pry bar under the tire, check to see if there is any vertical (axial) movement at the lower joint while you apply pry force under the tire. A second check is to grasp the tire at the top and bottom, then pull and push, back and forth while checking to see if there is any side-to-side (radial) movement in the upper joint. Have a second person observe for any movement in the ball joints. Lower joint axial play spec limit is 0.05 inches and upper joint radial play spec limit is 0.06 inches, so you should detect very little or no movement if your joints are still good.

Alloy USA

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Huntington Beach, CA 92647
Alloy USA
Suwanee, GA 30024
Synergy Manufacturing
San Luis Obispo, CA 93401

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