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Old 08-17-2014, 11:46 PM   #1
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Absolute minimum to run 37's on jku

Worn out topic, I know. But I can't decide and I'm looking for a good discussion on what needs to be first and what can wait when moving to a 37 inch tire.

I'm a weekend warrior on the trails, and what I would consider "moderate" off road. I'm not looking to build a super epic badass rig, but I want to be able to keep up and I want to be able to handle a variety of terrain. Jack of all trades but master of none, if you will.

Iv decided I like the look of a 37 inch tire, while 35 would defiantly suit my needs off-road, the unlimited, in my opinion, looks a little off with less then 37.

My dilemma
I have a 3.5 rk max flex on the way. I'm running stock axles with Aussie locker in the front (d 30 I believe) and that's all iv got. I know imma need to beef up the axle, but after that and the lift and wheels and tires I will be slam broke.
What do I ABSOLUTELY need to upgrade before I move my 2008 jk unlimited x manual tranny out of the garage. I'm talking bare minimum to get me on the road. And then what do I need to look for first before attempting to get back on the trail?

I know there is no firm correct answer here, looking for informed opinions and discussions more then anything. Greatly appreciate any input!
Thanks guys!

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Old 08-18-2014, 12:30 AM   #2
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I'll tell you the most important thing you need....a bigger wallet. Running 37s on the cheap is a disaster waiting to happen.

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Old 08-18-2014, 02:21 AM   #3
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I'll tell you the most important thing you need....a bigger wallet. Running 37s on the cheap is a disaster waiting to happen.

Agree completely.

What you want is not inexpensive. Giving into instant gratification now will cost you a fortune more when something breaks.

Have discipline and build it the right way as your money allows.
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Old 08-18-2014, 04:10 AM   #4
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If you break a front axle ... Upgrade
You could gusset the upper C's
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Old 08-18-2014, 07:04 AM   #5
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I'll tell you the most important thing you need....a bigger wallet. Running 37s on the cheap is a disaster waiting to happen.
This. On our run this weekend, someone grenaded an axle. Not pretty. And just to "look cool" you are talking many many dollars and an axle swap and a whole host of other things to do it the right and safe way. Buy seat covers and stickers on a budget - dont try to do 37s on one.
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Old 08-18-2014, 08:32 AM   #6
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I built a "bare minimum" Jeep with 37" tires a few Jeeps ago. It was this JKUR that had a 2 1/2" lift, flat fenders, and a sleeved and gusseted front Rubi 44 axle, with 5.38 gears in both axles. This was the bare minimum, I even kept the stock spare tire.



I did break a front axle u-joint, and then replaced the front axle shafts with RCV shafts. After that I wheeled the Jeep regularly, with no more problems (moderate four wheeling only).
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Old 08-18-2014, 10:31 AM   #7
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Quote:
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I'll tell you the most important thing you need....a bigger wallet. Running 37s on the cheap is a disaster waiting to happen.
well said.

Quote:
Originally Posted by kjeeper10 View Post
If you break a front axle ... Upgrade
You could gusset the upper C's
sleeve's and c's should be on your to-do list whether you go 35s or 37s with a dana 30. when your axle shaft blows up (it will) replace with chromo shafts. i wheeled for about a year and a half on a Dana 30 w/37s... with a ton of extras.

your ball joints are going to fail quickly, your tie-rod ends (tie rod and drag link).

save your money and do it right... rather than have to chase issues for the next 18 months. if you're trying to do it on the cheap, you're going to regret it.
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Old 08-18-2014, 10:56 AM   #8
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Good point on the ball joints. I forgot to mention that on that minimum build for 37s that I did, that I also changed to Synergy ball joints. The stock ball joints didn't even last 5000 miles with 37" tires.
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Old 08-18-2014, 11:22 AM   #9
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Welcome to the Forum!

Dusthol said it best: $$$. The 37" tire look is not cheap. You don't ABSOLUTELY need anything before you install 37" tires. Parts will just to fail.

For instance the stock ball joint on my '09 failed rapidly after I installed 37s but I had been running 35s for a while.
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Old 08-18-2014, 11:53 AM   #10
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Like you already said, Truss/gusset for any off-roading with the D30.
Flat/cut fenders for off-roading
Trim pinch seems in the rear for off-roading

For an '08 gearing IMO will be a must. My 4.10's with the 3.6 isn't enough with 37's.

If you don't have a front stabilizer you should.

Would be a great time to upgrade the bolts.

Be prepared for Ball Joints, they will fail
Be prepared for axle shafts, they will fail
Be prepared for drive shafts, they will fail
Consider upgrades for brakes, there's a lot more mass to stop

I'm sure I left something out........

I'm on a similar trek with ours. I know things are going to fail and I'm prepared to replace broken parts with the proper ones when they do.

Good luck!
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Old 08-18-2014, 12:52 PM   #11
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Do not put a single dollar into that D30.

From the sounds of it you'd probably be happy with a beefed up front D44.

Don't waste $$$ on a truss, if your gonna play har enough to bend it a truss ain't gonna help shuff.... Been there done that.

Factory 44 geared to 5.13's
Gusset the C's
Slap in a set of ProSteer BJ's
Upgrade your TRE's
Chromoly axles with full cir clips or RCV's
If you wanna do it somewhat half ass right I'd throw in some arb's
May wanna upgrade the brakes if your not comfortable stopping 37's. Some people don't have a problem, some just won't stop!

Slap a set of chromoly axles in the rear and go have some fun.

That was my minimum 37's list... All that went out the window when I bent the front end and had to throw in a ProRock, now I'm just waiting for the rear to blow so I can justify a PR60 for the rear.
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Old 08-18-2014, 03:52 PM   #12
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You guys are awesome.

The wallet thing is so very true.
I'm all about the break it and then upgrade it, and I have a car I can drive while I work on the jeep. But I really appreciate all the input.
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Old 08-18-2014, 07:13 PM   #13
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I'm all about the break it and then upgrade it, and I have a car I can drive while I work on the jeep.

Just factor in the cost of an off road recovery and tow out, if the D30 or other parts fail in the back country.

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