Help with UCA, offset, and back spacing

[Russ757]

I try and research before asking but at this point my eyes are crossed. Currently using 5100s for a 2" level but want to move up to 3". Also running 22x10 -18 with 285/55s. 

 

As I'm looking to move 3" I'll be at that limit of needing UCAs. I had my eyes on the cognito kit but started to read that some have issues with tires rubbing the UCA. Obviously not ideal. 

 

I figured out my wheels have a 4.79 back space and the cogs need 5.75. I asked them if would work and they gave me the company line "abt this is our recommendation" I spoke with another rep and they said I would need a 6mm/.25" spacer. As my 285s already stick out a good bit, the last thing I want to do is push them out further. 

 

Compounding the issue, I just bought new rims and tires two weeks ago. So replacing those is also out of the question. 

 

So when discussing backspacing, if it says works with a 5.75 backspace does that mean it has to be less or more than 5.75 in order to work? I thought since I have -18 and theres quite a bit of room from the stock UCAs to the falkens currently, I figured I'd be good. 

 

If the cogs don't work out, are there any other quality UCAs that would work with 4.79 backspacing? 

 

 

 

 

Edited March 13, 2025 by Russ757
Pics

[03blackz71]

Your current setup will work with the Cognito UCA with plenty of room.   If your BS is less then there suggestion that is good.     I run the Cognito UCA with the bolt on balljoint and I run the stock Trailboss wheels with 35x12.5x18 tites and I barely clear them.

[GETGONE]

This is a great video to help understand backspacing and offset:

 

 

[Russ757]

6 hours ago, 03blackz71 said:

Your current setup will work with the Cognito UCA with plenty of room.   If your BS is less then there suggestion that is good.     I run the Cognito UCA with the bolt on balljoint and I run the stock Trailboss wheels with 35x12.5x18 tites and I barely clear them.

 

Thanks. That's what I figured and thought. I just don't understand why cognito couldn't say that even though I provided all my info and even reasked with more specifics. 

 

For ref, here is the kit I'm looking at with TB cv axles 

https://cognitomotorsports.com/cognito-3-inch-performance-ball-joint-leveling-kit-with-fox-ps-coilover-2-0-ifp-shocks-for-19-23-silverado-sierra-1500-2wd-4wd.html

Edited March 14, 2025 by Russ757