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Purpose of new UCAs with larger tires?

Discussion in '3rd Gen. Tacomas (2016+)' started by Acharenio, May 22, 2020.

  1. May 22, 2020 at 10:53 PM
    #1
    Acharenio

    Acharenio [OP] Member

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    I have a 2018 trd off road with a 2inch lift, ome, i want to put 285-75-16 tires and someone told me i need to change the uca's, pardon my ignorance but what the uca's do and have to do with bigger tires, if anybody can please explain and make me understand.
    thank you so much.
     
  2. May 22, 2020 at 11:14 PM
    #2
    boston23

    boston23 Well-Known Member

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    If fixes alignment issues caused by bigger tires and lift
     
    71tattooguy and whatstcp like this.
  3. May 22, 2020 at 11:39 PM
    #3
    Ronzio

    Ronzio Well-Known Member

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    Allows for more caster something your stock UCAS are limited but at 2 inch of lift stock uca’s are still okay. If you want the steering wheel to feel “more heavy” less floaty or increase straight line stability at speed change them out.
     
    Low Ranger likes this.
  4. May 22, 2020 at 11:53 PM
    #4
    nudavinci64

    nudavinci64 Well-Known Member

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    Its going to be close with 285/75/17 you are going to need a good CMC job and pinch welds for that to clear. I have a few buddies with 3rd gens with that. Most are running closer to 3" of lift as well.
     
  5. May 22, 2020 at 11:56 PM
    #5
    Matmo215

    Matmo215 Baylor '23

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    You don’t need UCA’s because of tires. You need it because of the lift to get your trucks alignment back into spec.
     
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  6. May 23, 2020 at 6:42 AM
    #6
    Acharenio

    Acharenio [OP] Member

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    sorry, what are the CMC's?
     
  7. May 23, 2020 at 6:57 AM
    #7
    Technique

    Technique Well-Known Member

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    Cab mount chop
     
  8. May 23, 2020 at 7:01 AM
    #8
    Pilsner

    Pilsner Well-Known Member

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    True but being able to push caster forward moves the tire away from the cab mount.
     
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  9. May 23, 2020 at 7:08 AM
    #9
    Acharenio

    Acharenio [OP] Member

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    Thank you so much
     
  10. May 23, 2020 at 7:08 AM
    #10
    JoeCOVA

    JoeCOVA IG @MightyJoeFlannel

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    High caster upper control arms and adjustable upper control arms allow you to adjust your alignment based on the new characteristics of the vehicle after being lifted. This also facilitates the fitment of larger tires by gaining positive caster and allowing you to adjust for maximum wheel fitment.

    That said other factors include CMC and wheel specs in regards to fitment so while you may have a good alignment your wheel specs may require additional modifications.
     
    Acharenio [OP] likes this.
  11. May 23, 2020 at 8:38 AM
    #11
    Matmo215

    Matmo215 Baylor '23

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    Yes, but it’s not required. The point I’m making is you don’t need them. Sure it helps eliminate rubbing, but sure isnt required. Some people will just trim as needed.
     
  12. May 23, 2020 at 4:18 PM
    #12
    Acharenio

    Acharenio [OP] Member

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    Thank you for the help, i understand that, i called discount tire today and ask them if there will be any problems putting that size of a tire and the guys said it should be no problem, i don't know is he said that to sale the tires or it is no problem, this days you can't trust many people all they care about is $$$$$
     
  13. May 23, 2020 at 4:32 PM
    #13
    gotoman1969

    gotoman1969 Well-Known Member

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    Also depending on what factory wheel you have and what offset 285s may rub the UCA.
     
  14. May 23, 2020 at 4:43 PM
    #14
    ZekeR7

    ZekeR7 Well-Known Member

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    You shouldn’t ask those guys at a regular discount tire. A lot of techs don’t even know unless you go to an off-roading shop that specializes in Tacoma.
    Everyone here already covered the benefits of UCA and the reason you need it for 285/75/16.
    Those are 33s and you are going to need more than just UCA. You may need (every Tacoma is different): CMC, bend the pinch weld a bit, UCA, 3+ caster when you get alignment, a different backspacing/offset wheels.
    Those tires technically fit without doing anything, the problem is they will rub when you turn or hit a bump. It can even be as bad as just braking and your front end dips and starts rubbing.
     
    Acharenio [OP] and JoeCOVA like this.

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