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Unread 09-16-2013, 08:05 PM   #16
HappyTrails
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Quote:
Originally Posted by JTPhoto View Post
You also do not have enough wheel backspace. factory wheels at 6.75" backspace - 1.5" spacer only gives you 5.25 backspace. With 37" tires you should have 4-4.5" backspace. This will help give you room to flex + bumpstops to help protect inner fenders.
Oops, I forgot that I am running wheels with 4.5" BS + 1.5" wheel spacers (=3.00" BS).

As per bump stops, you need to flex your rig to determine how much YOU need. Each rig is different (weight, suspension kit differences, etc). I'm running 3" in the rear and 2" in the front, plus flat fenders, on only 2.5 RK Max Travel lift. YMMV.

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Unread 09-16-2013, 08:07 PM   #17
Filthy-Beast
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Factory is 6.25" or at least it is on the Rubicon wheels. so he's at 4.75". I went with 1.75" spacers so I could get to 4.5" with my 35s. They still rubbed the track bar without a steering stop adjustment.
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Unread 09-16-2013, 08:44 PM   #18
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Quote:
Originally Posted by Filthy-Beast
Factory is 6.25" or at least it is on the Rubicon wheels. so he's at 4.75". I went with 1.75" spacers so I could get to 4.5" with my 35s. They still rubbed the track bar without a steering stop adjustment.
I run 4.5" BS with true 35" Pitbull Rockers and have no rub with no adjustment to the steering stops so maybe your Rubicon rims are not 6.25" BS.
Point is you will need less then 4.5" BS especially with 37" tires if you don't want the front to rub the control arms.
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Unread 09-16-2013, 08:44 PM   #19
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Quote:
Originally Posted by Kmin View Post
I did read some of the linked thread. It is quite extensive and I will defiantly be visiting it again soon.

Good news though! I went ahead and took another 1/2" off of the seam and I no longer have the rubbing. I do not think it will be enough when I get offroad, however I can drive it on the road again.
Yup read that thread and do the things that we did to get the height of your bumpstops. If you are running stock fenders my guess is that you will need atleast 4" in the rear (I have 3" on 35's), and 3.5" up front.

I also agree that you need new wheels to be running those tires. You have way to much backspacing to run a 37x12.5.

If you want to use less bumpstop the only way I see you being able to do that is to get flat fenders AND new wheels with 4.5" of backspacing. If you do this you will be able to run 2.5" up front and probably 3" or maybe 2.5" in the rear. I had 3" because of my fenders and would probably be at 1-2" with flat fenders.

As for the people saying you have to lift more, I would disagree. You will still rub like crazy offroad unless you do what I said above. The best way to be sure is to follow what was done in that thread.
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Originally Posted by cyberpyrot View Post
is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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Unread 09-17-2013, 06:14 AM   #20
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Quote:
Originally Posted by Kmin View Post
I figured order some new shocks and maybe lift it another 2" with a spacer kit

Lift height alone does not give you the ability to run larger tires. Increasing the ride height with a coil spacer alone will not increase your tire clearance. A suspension lift does not increase tire clearance without lengthening your bump stops.

Body lifts, Bump stops, flat flares, and trimming all increase your tire clearance.

Body lifts, flat flares, and trimming all increase tire clearance without decreasing the amount of suspension travel you have.



Quote:
Originally Posted by JTPhoto View Post
You also do not have enough wheel backspace. factory wheels at 6.75" backspace - 1.5" spacer only gives you 5.25 backspace. With 37" tires you should have 4-4.5" backspace. This will help give you room to flex + bumpstops to help protect inner fenders.

Factory wheels have 6.25" of Backspacing. The 1.5" spacer will put him at 4.75" of backspacing. Less backspacing will require less bump stop or tire clearance though. Lucky for him the BFG KM2's run as small a they do.
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Unread 09-17-2013, 07:32 AM   #21
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Quote:
Originally Posted by SLADE
Factory wheels have 6.25" of Backspacing. The 1.5" spacer will put him at 4.75" of backspacing.
NP Thanks I stand corrected. NTL 4.75" is still not enough backspace, especially for 37x12.50.
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Unread 09-17-2013, 08:14 AM   #22
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I have seen the pinch seem cut more aggressive somi would start there. Since you live in Illinois and the isn't much rock crawling I would also suggest a small body lift. The closest legal off road trails is the cliffs, the badlands, and like you mentioned the dunes. Both have more hill climbing or off camber wheeling. Keeping your center of gravity low with the body lift will help you more in this neck of the woods rather than going with a larger spring lift which may also require new driveshafts.

I am sure I am going to get body lift haters but like any tool they have their place.
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Unread 09-17-2013, 08:21 PM   #23
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Originally Posted by wingit View Post
I am sure I am going to get body lift haters but like any tool they have their place.

They do have plenty of haters. Most don't understand how they work with the suspension and the benefits they have. Some just don't like the way they look. A body lift works well with a suspension lift, especially when stuffing the most tire possible with the least amount of lift.
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Unread 09-18-2013, 06:05 AM   #24
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Body lift on a JK like OMGZ you NEWBZ!





Yes i think a 1' -1.25" body lift would benefit you incredibly.
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Unread 09-18-2013, 06:20 AM   #25
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Originally Posted by bogleparsons View Post
Body lift on a JK like OMGZ you NEWBZ!

Yes i think a 1' -1.25" body lift would benefit you incredibly.
And he will probably still need more bumpstop.
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Quote:
Originally Posted by cyberpyrot View Post
is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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Unread 09-18-2013, 06:42 AM   #26
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Originally Posted by COLOUXJ View Post
And he will probably still need more bumpstop.
Agreed.

37's with flat flares and a body lift, 0"-1" Front and 2.5" rear extended bump stops will be needed.

37's with flat flares and no body lift, 1.5"-2" front and 3.5" rear extended bump stops are needed.
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Unread 09-18-2013, 07:30 AM   #27
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You always need more bump stop.... or cow bell
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