My Total Chaos UCAs are squeaky too, especially after it rains or I drive through water. They require a lot of grease.
I had been able to quiet down the polyurethane bushings with a generous helping of marine grease. But the ball joints are worn out plain and simple. I couldn't source the replacement joints otherwise it would have been a lot less work and more cost-effective to just replace them.
how much lift do you have? and did you re-align after going back to stock? just wondering if you needed the nitro UCAs in the first place.
I have barely 2" of lift (prolly more like 1.5" with the big fat bumper) and am still running the Toyota torsion bars. I don't really needed the nitro UCAs but found a good deal on them last year. Also, they allow about 2.5" caster which made the truck track better at highway speeds.
As for the alignment - I marked the adjustment cams with a paint pen before taking off the old UCAs and just matched those marks when I put on the new ones. So far she tracks straight.
My steering rack is leaking slightly and the bushings are deteriorated. I am saving up for a new rack and will get her aligned after that.
With new driveshaft, both CV Axles, all rear control arms, panhard bar and ball joints and tie rod ends replaced - the steering rack is the only thing left that I bought the truck with!