Are you on 37s? Suspension and Tire assistance please!

Discussion in 'Suspension' started by Desmobullet69, Nov 29, 2017.

  1. Desmobullet69

    Desmobullet69 New Member

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    Are you on 37s??? If so are you rubbing, how much are you rubbing and where?

    What suspension setup are you running? (Im interested in the RPG adjustable collars)

    Did you put a larger block in the rear or go to deaver leafs...or something else Im unaware of?

    Are you running 37x13.50s or 37x12.50s? Pros and cons with your decision is appreciated as well!

    Thanks in advance!
     
  2. CSJr

    CSJr Member Military

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    I am running 37x12.5r18. It mostly depends on the tire you get to prevent rubbing, but all 37" tires require some kind of height increase in front to mitigate rubbing. I hear 1.5" preload collars from your favorite vendor will prevent rubbing with the 37" KO2. The 37" KO2 is technically a 37" tire but smaller than some other 37" tires.

    I have the 37x12.5 Ridge Grapplers. Both tires rubbed on 3/4 turn in the lower inner wheel well even with my 1.5" preload collars. I had minor rubbing on the passenger side and constant rubbing on the drivers side with RPG 1.5" collars installed. I did some trimming on the drivers side to eliminate the "popping" sound I heard when the rubber lining lifted up and dropped inside the wheel well when the tire rubbed against it. Even though the popping sound was eliminated, the rubbing noise still occurred.

    Instead of trimming more, I decided to lift the front another 1.5" with ReadyLift 1.5" spacer. I did the ready lift collar instead of more preload because I didn't want the springs any stiffer. This eliminated all rubbing. I propose my front is now 2.7" higher than stock as the preload RPG collar isn't really 1.5" raise.


    In order to prevent the nose high look, I had to have the rear up ~1.75". I accomplished this with adding a leaf to the leaf springs. I now have 5 leafs instead of 4. The adding a leaf serves many benefits. It returns an optimal rake that I like, the back is 1" higher than front. It prevents sag upon heavy loads as I have more haul capacity now. It has more progressive load handling. And, it keeps similar riding characteristics as the new leaf is the same light gauge steel and added the 3rd leaf down instead of the second.

    Hope this helps.
     
    Last edited: Nov 30, 2017
  3. Desmobullet69

    Desmobullet69 New Member

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    Thanks @CSJr! I appreciate your input. I think Im going to just add the Deaver HD rear leaf pack. It will give me a better ride and the additional height in the back that Ill need and want. The front Im thinking ill do the adjustable RPG collar to get the height I need in the front to prevent rubbing and the need to do any major cutting on the truck which just makes me cringe!

    I think Im going to go to a 20” wheel so I can run a larger brake in the front as well. I dont think there is a bigger brake kit for anything in the 18” wheel range. So now my only decision is if I should go with a 12.50 wide tire or a 13.50 wide....The truck is so wide that I think the 13.50 would look better but I also dont want that “roller skate” look either. 1” - 1.5” outside the fender is all I want. Im thinking the 13.50s will be around the 2-3” area...

    Input anyone?
     
  4. Gunnar Texas

    Gunnar Texas Member

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    I'm working with an experienced shop that has done a lot of lifts for 37's. They told me you have to go 3-4" higher and there are some new Gen2 fenders coming in January to get rid of the rub. I really just wanted a level look with a front 1.5" collar so I'm sticking with my original wheels/tires. All the cutting and painting wasn't worth it at this point with a brand new truck. I'm putting that money into the Baja Designs Pro lite kit instead. I was too worried about the warranty with that high of a lift and the cutting that will be needed. My smarter half was worried about safety also.
     

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