Originally Posted by IcarusLSC
I was browsing through the RockAuto site at parts for my steering, and noticed they have adjustable ball joints. I've never seen these before so was curious. Do people use them a lot on the Jeeps or is it gimmick/not needed?
The adjustables started when Jeep had an issue with a bunch of axles IIRC in 2000 or 2001 having a cross caster issue which caused a pulling to one side problem.
Someone developed an adjustable upper to fix the problem and they had them available on a TSB that included the uppers and the installation cups for a balljoint press.
A few years later the aftermarket came out with them and I notice they now have the lowers.
They can be used to solve a caster or camber issue up to about 2° in 1/2° increments. We used them in the South America XJ bolt in HP Dana 44 fronts to fix one side that was out about 2°. That was before the adjustable lower which caused the axle shaft to be closer to one side of the tube. With the lower, you would use 1° with each to re-center the shaft in the tube if you needed 2° total caster change.
So no, not a gimmick, but a problem solver when needed.