Outer tire tread wearing, 6" lift, stock UCA

Bought the truck a couple of years ago. 37s on them. I've had the alignment done numerous times through the years and it's within spec. It's a ProComp lift. And something is chewing the outer edges of my tires to death. Visually (and with a torpedo level) the front tire camber looks very straight. Yes, it could be toe in, but again, it aligns. Only thing I can think of is the UCA. Would a stock UCA on 6" lift cause this? It does 'seem' like the tire angles when turning, thereby, eating my outer tread.

Thoughts?

 

It’s your lift. Just cause it makes the alignment machine turn green with the wheels pointed straight doesn’t mean you geometry isn’t all jacked up. There’s some trade offs to be had for a lifted truck. Tire wear May be one of yours. Worth taking it to an off-road shop that does lifts and alignments if you haven’t to see if they can get you any better results.

 

Stock UCA isn't helping anything.

 

Measure your toe with a tape. The higher center of gravity is probably pushing the outer edge of the tire in turns as well

 

Yeah, I'll got take it to an off road shop and have them take a look at it. I'm a shade tree mechanic but I just cannot figure out how UCAs may cause this. Not saying it would not, just don't understand the geometry of the UCA. If someone knows a good simulation type video that show a UCA in motion while turning, I'd be very interested.

 

What angle does your uca sit at when at rest? The higher the angle, the worse your alignment will be when driving.

replactment ucas for example have more caster built in so your alignment will be different when cycling

 

Decent explanation of how aftermarket UCA can help a lifted Toyota.

https://youtu.be/aHIaMIYInwo?si=L-aSPMqBgWtfbaa8

 

I like this guy a lot too

https://youtu.be/huMztKaHsUE?si=8sZWJROdwW56TtlJ

 

Thanks @KNABORES these are helping me understand the purpose of an aftermarket UCA.

@Hbjeff, here is a pic and the angle that the OEM UCA is sitting at rest on the truck. Looks like 9-10 degrees, depending on where I put the level. Is that bad/good?

 

Do you have your alignment numbers? That angle is definitely steeper than stock, hard to tell from the zoom how much

 

I don't have the numbers. It's probably been a year since the last alignment, but I only put on about 5k miles a year on the truck.

 

Need more positive camber… had issue and a little positive fixed this

 

Positive camber: sounds good, and the only way to accomplish that is with an aftermarket UCA. Makes sense.

 

Yes aslong as you’re truely maxed out on your LCA adjustment. Or try another alignment shop.