Stretching Rear on a 4dr
Thread Starter
JK Newbie
Joined: Jul 2015
Posts: 15
Likes: 0
From: Tennessee
To run 42x13.5" tires I would recommend a 72" WMS with a 3.5-4" BS to maintain full turn and have room for axle rotation during articulation. Of course your suspension design and amount of travel you have will be a factor. With a conventional coil set up at 4" of lift you are not going to have much up travel without major cutting of the tub, but being a crawler that may not be an issue for you. I would really recommend you look at a double triangulated long arm with coil overs if you are looking to climb about anything.
You could also just by "Bane" it is already set up on 42" MTR's and ready to roll. I think it is still for sale. The first thing he did was buy 42" tires then the learning began on how to fit them.
You could also just by "Bane" it is already set up on 42" MTR's and ready to roll. I think it is still for sale. The first thing he did was buy 42" tires then the learning began on how to fit them.
. Wheeling in the south means your on most of the time rock/mud mixed trails which will call for the need of tire spin. Looks like ill stick to the 37/38" tire size with a full polished set of rubi axles to start.
JK Jedi
Joined: Oct 2010
Posts: 6,222
Likes: 376
From: Southwest Reno, NV
I am not trying to talk you to of a JKU but have you considered a LJ? Not such a long wheel base and you won't have the electronic issues to deal with on extreme builds. If you run tight trails the LJ will not be as wide either. I am at 86" outside of tires with 40's. If I had to do it again I would have built a buggy and kept the JK on 35's
JK Newbie
Joined: Aug 2014
Posts: 27
Likes: 0
From: ATL, GA
To run 42x13.5" tires I would recommend a 72" WMS with a 3.5-4" BS to maintain full turn and have room for axle rotation during articulation. Of course your suspension design and amount of travel you have will be a factor. With a conventional coil set up at 4" of lift you are not going to have much up travel without major cutting of the tub, but being a crawler that may not be an issue for you. I would really recommend you look at a double triangulated long arm with coil overs if you are looking to climb about anything.
You could also just by "Bane" it is already set up on 42" MTR's and ready to roll. I think it is still for sale. The first thing he did was buy 42" tires then the learning began on how to fit them.
You could also just by "Bane" it is already set up on 42" MTR's and ready to roll. I think it is still for sale. The first thing he did was buy 42" tires then the learning began on how to fit them.
JK Enthusiast
Joined: Sep 2013
Posts: 398
Likes: 2
From: GA
JK Newbie
Joined: Aug 2014
Posts: 27
Likes: 0
From: ATL, GA
JK Freak
Joined: May 2007
Posts: 947
Likes: 0
From: directly under the sun
It's not all that hard been running that setup for 3 years I did stretch my rear about 3" to put the wheel in the center of the wheel well your mostly looking at getting rid of the pinch seam that what gets in the way when your at full stuff.
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JK Jedi
Joined: Apr 2011
Posts: 4,482
Likes: 2
From: Neenah, Wisconsin
I wouldnt say the pbr is true to size. It was measured at 40.25 at 20 psi on a 4 door.
Dirt nailed it all. I could have got a steal on a Jimmies chassis and kept the jeep on 35s.
All in all you have alot to research. Id say 99 percent of the guys with jks on 40s dont wheel them to there full potential. Mainly show and moderate offroad or youd see a lot more broke. Ive seen plenty of d60s get destroyed on 40s. So comes down to your needs and wheeling styles. If for show bolt on the evo kit and ramp it off a curb.
Dirt nailed it all. I could have got a steal on a Jimmies chassis and kept the jeep on 35s.
All in all you have alot to research. Id say 99 percent of the guys with jks on 40s dont wheel them to there full potential. Mainly show and moderate offroad or youd see a lot more broke. Ive seen plenty of d60s get destroyed on 40s. So comes down to your needs and wheeling styles. If for show bolt on the evo kit and ramp it off a curb.
Last edited by Maertz; Jul 7, 2015 at 05:02 PM.
Thread Starter
JK Newbie
Joined: Jul 2015
Posts: 15
Likes: 0
From: Tennessee
I am not trying to talk you to of a JKU but have you considered a LJ? Not such a long wheel base and you won't have the electronic issues to deal with on extreme builds. If you run tight trails the LJ will not be as wide either. I am at 86" outside of tires with 40's. If I had to do it again I would have built a buggy and kept the JK on 35's
I didnt mention im 6'6" 290lb bodybuilder so i dont really fit in much of anything to begin with 
. I will say LJ are nice and was actually my choice before the JKU. There just no damn room in one for me or anyone else behind me. Car seats take up way too much room.
Thread Starter
JK Newbie
Joined: Jul 2015
Posts: 15
Likes: 0
From: Tennessee
When I made the jump to 40" I got new control arms and it pushed the dead end back about 2" which really helped. Also did apt of trimming
Attachment 617179
Attachment 617179
That pic of your jeep on the trail looks like Upper Ditch at Hawk Pride Mountain.