Notices
Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

PLEASE DO NOT START SHOW & TELL TYPE THREADS IN THIS FORUM

What's Needed for 37's with Stock Fenders

Thread Tools
 
Old 05-22-2016 | 02:14 PM
  #1  
Number8's Avatar
Thread Starter
JK Newbie
 
Joined: Jul 2014
Posts: 22
Likes: 0
Default What's Needed for 37's with Stock Fenders

Time to start planning the next phase...

I want to keep the stock fenders but step up to 37's for wheeling. What do I need to do to get there?

What I have:
- 2014 Rubicon (D44's)
- Sleeves & Gussets
- 2.5" Lift (on its way out)
- Set of mounted 35's that I'll keep for daily use

What I want/need:
- 3.5" or 4.5" Lift (pref. MetalCloak)
- 8 Control Arms (pref. MetalCloak)
- 37's (BFG or STT)
- 17" Beadlocks (3.5 or 4.5 BS)
- Regear (4.56 or 4.88 or 5.10)
- Drive Shafts
- RCV Axles
- Maybe Ball Joints when needed

My biggest question:
I want to stay as low and narrow as possible (but still keeping un-trimmed stock fenders!). How will 37's fit with with 3.5 lift and 4.5 backspace? I'm shooting for the tires to tuck inside the fenders.

Next question:
What gear ratio? It's a daily driver, Tennessee hills, off-road often.

Anything else I'm missing?
Anything else I need to consider?

Thanks!
Old 05-22-2016 | 02:28 PM
  #2  
karls10jk's Avatar
Super Moderator
FJOTM Winner
 
Joined: Dec 2010
Posts: 5,642
Likes: 484
From: Knoxville
Default

These would be a good addition to your build if you insist on factory flares. Otherwise- metalcloak flares, cut your flares a little bit (not full flats), or look at another high clearance fender like the Modern Classic Enterprises flexible flares.

2-Door JK Factory Style Hi-Clear Flares #77072341AC

Obviously the 4dr version though....
Old 05-22-2016 | 02:41 PM
  #3  
nthinuf's Avatar
JK Jedi Master
FJOTM Winner
 
Joined: Jan 2008
Posts: 11,463
Likes: 162
From: Austin <--> Colorado Springs
Default

Here is MC 3.5" and 37" Cooper STT Pro's with stock fenders.

Click image for larger version

Name:	IMG_0651.jpg
Views:	2397
Size:	560.8 KB
ID:	647729

Fairly light jeep. Haven't measured, but probably got 4.5" from the coils.

With a 4.5" backspace on the rims, you will probably be adding washers to the steer stops. I am running spacers as well for an effective 3.0".

I have a set of trimmed stock flares also, swapped back to these for the winter. When running this uncut set, I add another bumpstop spacer front and back to keep the tires off the flares.

Last edited by nthinuf; 05-22-2016 at 02:47 PM.
Old 05-22-2016 | 02:46 PM
  #4  
Number8's Avatar
Thread Starter
JK Newbie
 
Joined: Jul 2014
Posts: 22
Likes: 0
Default

I have AEV bumpers. That's my main reason for keeping the stock fenders (plus I appreciate the coverage). May replace bumpers and go to flats someday, but that's another stage. I want to see if I can make the 37's work with a 3.5 lift.

Also have a great lead on some used beadlocks, but they are 4.5 backspace. I hear 3.5 backspace is ideal for 37's, but concerned they'll be out too far to tuck under the fenders.
Old 05-22-2016 | 02:50 PM
  #5  
nthinuf's Avatar
JK Jedi Master
FJOTM Winner
 
Joined: Jan 2008
Posts: 11,463
Likes: 162
From: Austin <--> Colorado Springs
Default

Originally Posted by Number8
I hear 3.5 backspace is ideal for 37's, but concerned they'll be out too far to tuck under the fenders.
Click image for larger version

Name:	IMG_0665.jpg
Views:	974
Size:	505.7 KB
ID:	647730

37x12.50 STT Pro, 4.5" backspace + 1.5" spacer
Old 05-22-2016 | 02:52 PM
  #6  
Number8's Avatar
Thread Starter
JK Newbie
 
Joined: Jul 2014
Posts: 22
Likes: 0
Default

Originally Posted by nthinuf
Here is MC 3.5" and 37" Cooper STT Pro's with stock fenders. <img src="https://www.jk-forum.com/forums/attachment.php?attachmentid=647729"/>
Looks like enough room. Mine is heavier with winch, bumpers, gear. How do they fit when flexed with the spacer. Do you stop below the fender or do they tuck?
Old 05-22-2016 | 05:45 PM
  #7  
TheDirtman's Avatar
JK Jedi
FJOTM Winner
 
Joined: Oct 2010
Posts: 6,222
Likes: 367
From: Southwest Reno, NV
Default

You are not going to tuck 37's inside the fenders.
Old 05-22-2016 | 06:46 PM
  #8  
ROXNMUD's Avatar
JK Newbie
 
Joined: Mar 2011
Posts: 24
Likes: 0
From: Phoenix,AZ
Default

I'm running 37" KO2's on 3.5" lift with stock fenders, just trimmed a small piece inside the front of the front fenders and cut pinch weld and Rubicon sliders. Flexes good, tires don't hit. 2013 JKU.
Old 05-22-2016 | 06:48 PM
  #9  
Number8's Avatar
Thread Starter
JK Newbie
 
Joined: Jul 2014
Posts: 22
Likes: 0
Default

Originally Posted by TheDirtman
You are not going to tuck 37's inside the fenders.
Best I'm going to get is to bump stop to the outer fender? Any opinion on doing this with a 3.5 or 4.5 lift?

Last edited by Number8; 05-22-2016 at 06:58 PM.
Old 05-22-2016 | 06:59 PM
  #10  
Number8's Avatar
Thread Starter
JK Newbie
 
Joined: Jul 2014
Posts: 22
Likes: 0
Default

Originally Posted by ROXNMUD
I'm running 37" KO2's on 3.5" lift with stock fenders, just trimmed a small piece inside the front of the front fenders and cut pinch weld and Rubicon sliders. Flexes good, tires don't hit. 2013 JKU.
Any pics of where you trimmed the fenders? I'm good on the pinch seam and rails.



All times are GMT -8. The time now is 08:16 PM.