I need help from an alignment expert

Good information! I have JBA UCAs on my truck, I tried putting them on hers and they fit fine, about 1/2 inch from the tires, but when you turn the tires all the way around, the opposite side rubs the rubber. I don't know if that would be a problem once the truck is in motion and the suspension is doing its thing.

 

Hey those are my specs <3

Camber doesn't look positive at all.

 

Yes, with Maxtrac spindles, Bilsteins at zero and OME 883. Around 5.5 inches.

 

It's exactly what I want! It looks great! What do you have on your truck that you could have those numbers? By the way, could you tell me how much you got the caster and toe with -3 camber?

 

My specs are the same as gotoman1969. 4 degrees caster, -0.5 camber and .05 toe in

JBA high caster UCA and CMC. ~1.65" lift with ADS coilovers.

 

Wheel specs and tires?

 

I wonder if the Maxtrac spindle dive the illusion of positive camber since that increase track width by .75” on each side. My truck doesn’t look like it has positive camber at -.5.

 

17x8.5 -10
285/70

 

Same here . I’m running 2.75” lift, 17x8.5 -10 , 285/70s and JBA ucas.

 

Hers are 0 offset. Maybe that's why my JBL's touch the tire a little bit at full rotation.
How bad could that be when the suspension is in full operation?

 

JBA has known compatible fitments posted on their site. You really don't want rubbing ever on suspension components.

JBA STD High Caster Upper A-arms for Toyota Tacoma with 1 to 4-Inch Lift Kit (jbaoffroad.com)

 

No, because as they do not change the geometry of the suspension, it must be aligned (according to Maxtrac) to the specs. How much lift do you have?

 

OK, I saw your answer after my question. Maybe I should install a new lift kit higher than 1.5 and change the oem UCAs? It's like a lot of money invested LOL! I was thinking of just correcting the positive camber.

 

Not really, but with most things in life, the answer is it depends. Vehicles vary so getting your truck on the rack is the only way to tell if you can get -3 out of it. You'll want max caster with a leveling kit and that's the same setting on the rear bolt for max negative camber. Just know that you will be under spec on caster at zero camber and you will lose even more going negative. Excessive negative camber with insufficient caster will wander like hell in a straight line.

Speaking as someone with much experience who would consider himself an expert on the subject, it's not the quality of the tech, it's often the customer asking for the impossible or the request not making it to the tech. People ask for numbers because they read them online not knowing what they are or having the slightest idea why they're not possible. It's also liability aversion (as excessive as it is) and many shops will only do alignments to spec or as close to spec when they can't be pushed that far.

If you want numbers, make sure they're on the RO and if they don't match, make sure they document the reason on the invoice.

 

This was the answer of JBA when I contacted them; "That wheel and tire combination is right at the limit of what fit with a typical all terrain tire and our alignment specs. It may be the type of tire or the added or the additional - camber moving the top of the tire in closer to the arms that`s causing your clearance issue. Some wheel spacers would probably be the easiest fix". That is why I was interested in knowing if a negative camber could be obtained without sacrificing the caster with the original UCAs. Even if the caster remains in specs.

 

Weird. I have much more than 10mm space between my tires and the UCA's. All these trucks seem to be a little different though, so it really comes down do what your specific truck needs.

 

That's good information! So, maybe it would be a matter of installing aftermaket UCAs? But I tried my JBLs and they rubbed the tire a little when I turned the wheel all the way around. A set of UCAs smaller than the JBA. Could there be such a thing?

 

She has 0 offset on her wheels. Maybe is that?

 

Thats why I said I have more than 10mm clearance on mine. Provided she is an 8.5" wheel, then mine are the same but pushed 10mm farther out. I have about an inch of clearance though between the tire and UCA.

When you were rubbing, are you sure it was on the UCA itself? And that would be high caster JBA's? High caster arms can have issues if the alignment isn't performed as it totally changes the geometry up front. Lots of factors at play here.