Originally Posted by ronjenx

Go here to read about the OEM ball joints: https://www.jk-forum.com/forums/show...-Study-Results

Here is how to check them for wear:

Radial (side-to-side) movement in the upper ball joint should not exceed 0.060" (1.5mm).

Axial (up and down) movement in the lower ball joint should not exceed 0.050" (1.25mm).

A dial indicator is the best instrument to measure ball joint play.

Jack the front tire off the ground.
Place a jack stand under the axle next to the jack.
Lower to put some weight on the jack stand.
Place a long pry bar under the tire, from the side.
Have someone pry the tire up and down while you watch the lower ball joint for up and down play.
Axial (up and down) movement in the lower ball joint should not exceed 0.050"

Have someone grab the tire at top and bottom to wiggle the top in and out while you watch the upper joint for side play.
Radial (side-to-side) movement in the upper ball joint should not exceed 0.060"

Even if the upper joint checks good, change both if the lower checks bad.

Originally Posted by rinkishJK

I just recently helped my friend install spicer ball joints he got from qtec. They said spicer, and rugged ridge on the box.
They were not black like the ones op posted. I think he paid around 100$ or so for a side. Upper and lower.
They were similar to the stock ones.
The dynatrac ones are an upgrade, and totally different design, and greasable.
The dynatracs are well worth the money! I have had em in for a while and there still like new!