CAP Auto Products

First of all, I wouldn't get CAP UCA's again. I have a set on my Challenger, and am not particularly impressed, they will be replaced when finances allow (welds look ok). Their design isn't a bad one, but they have quality control issues with their MIG welding. I have seen sets with good welds. But I've also seen evidence of at least one catastrophic weld failure, and know of 2 other failures of their UCA's that may have been caused by faulty welds.

Second, it doesn't sound like you're going about this the right way. Yes, aftermarket UCA's do correct geometry. But, this is really only a big issue on lowered cars, so, if your car isn't lowered, you should be able to get an alignment to proper specs without issue. As mentioned, caster isn't a tire wearing issue. Camber can be, but in order for it to be a big problem you have to be talking about several degrees (2+) of positive or negative camber. Inside tire wear would suggest negative camber, and if lowered Mopars gained negative camber then no one would need tubular UCA's, because their lowered cars would have the negative camber they should be looking for to improve handling. Also, if you had -2 degrees of camber, your wheels would be visibly tilted in at the tops, they'd have a VERY obvious angle to them.

So, more than likely, you're toe is set wrong, which has very little to do with your UCA's. Or something is bent.

Finally, you need to post up your alignment specs. Most tire shops will only set your car for factory specs, which shouldn't wear out your tires, but is no longer ideal for modern tires. You need to find somewhere that will align your car to more modern specs. This is especially true if you get adjustable UCA's, since your alignment guy will really have to earn his money. And a lot of shops won't work on aftermarket suspension parts like adjustable UCA's.

I run -.7 degrees camber, +4.0 caster, and 1/16" of toe in on my Challenger without issue. I've run as much as -1.5 degrees of camber without ill tire wearing effects on the street.

A picture is worth a thousand words too. Post up a picture or two of your tire wear, and/or your wheels from straight out in front of your car with the wheels straight forward. I can see the the -.7 degrees of camber I have on my wheels from the front, if your camber is so bad its wearing your tires it will be visible.