What upgrades will I need to run 37s? - JeepForum.com
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post #1 of 10 Old 06-01-2014, 10:41 PM Thread Starter
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I'm gonna be getting my first jeep soon and I've always wanted to go big when i finally got one. I've got my eye on a 2007 4dr sahara and I was wondering what upgrades I might need to make that happen. I think I'm gonna go with a 4" lift but thats about all I've got so far.

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post #2 of 10 Old 06-02-2014, 12:36 AM
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U will need really low gearing also gotta trim some metal for them not to rub along with rims that have a good back spacing also a new engine lol
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post #3 of 10 Old 06-02-2014, 05:28 AM
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At a minimum:
  • Install front axle sleeve or truss.
  • Add C-gussets to the front axle C's.
  • Will need to trim the front edge of the rear fender wells (aka "the rear pinch seam") about 2-4". Use a Sawz-All.
  • Manual transmission: 5.13 gears front and rear.
  • Auto transmission: 5.38 gears front and rear (If you get a Rubicon) otherwise you can only go to 5.13 gears (Sport & Sahara).
  • Wheels that have 4.5" of backspacing or less. I run 3.0" backspaced wheels.
  • Extended bumpstops.

You may need to trim the front bumper or install a "stubby" front bumper.
Get a new spare tire carrier or new rear bumper that is capable of holding a 37" spare tire.
You can get away with a lower amount of lift if you trim the fenders into flats or get aftermarket flat fender flares. I am running 37's on only 2.5" of lift with flat fenders.

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post #4 of 10 Old 06-04-2014, 09:32 PM
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^ That's a pretty good list.

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post #5 of 10 Old 06-04-2014, 10:15 PM
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Synergy ball joints up front wouldn't be a bad idea either. 37s are going to quickly wear through the stock ones.

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post #6 of 10 Old 06-05-2014, 07:57 AM
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Remember that to lift a JK properly - and I emphasize properly - at 4 inches plan on about $4000 in parts in addition to the tire/wheels...I think HappyTrails has a better option for you as you can run 37s with 2.5 inches of lift for a lot, lot less money (read modifications)...just my 2 cents. Once you get above 2.5 or 3 inches the costs go up dramatically to make the required mods for the JK to be drivable IMO.

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post #7 of 10 Old 06-05-2014, 11:39 AM
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As well is this many a street jeep? If not it wont belong before you grenade the axles, unless you have a VERY light foot and never get in a bind. The steering in MUD or rocks will in the end kill the power steering pump and box. Reliability and 37"s is a rather expensive proposition. Everyone I wheel with that has 37 is built for larger tires. meaning at least D60s.

Brakes on the freeway will be hard pressed to stop 37s and the 100+ pounds each weigh. Done right in all, 4" lift tires rims, steering upgrades etc etc. will eat up 10k FAST.

Unless you NEED 37"s i would think a 35 would be better served as a DD and a good trail rig, much less cost and far more reliable. I love my 3.5+ lift and would NEVER go lower and 35s. It has been through the CON, to Dusy, Moab and thousand of crawling miles in AZ. Off road a Jk need to get that belly up. even with 5.38 those 37"s will be hard to turn

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post #8 of 10 Old 06-05-2014, 05:00 PM
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I have roughly $17 grand in my jeep to run 37's and Im still not done. Hydro Steering is next. So the short answer is money.

My kids weren't college material anyway.

On the bright side, my jeep looks bad ***.

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post #9 of 10 Old 06-05-2014, 08:24 PM
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post #10 of 10 Old 06-06-2014, 08:44 AM
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Technically, you can fit 37s on a 2.5" lift using 4.5" backspaced wheels (or spacers), a pinch seam cut and fender flare mods. However to run them reliably & effectively it takes quite a bit more. HappyTrails list above is a good summary. I have MTR/K 37s on my '09. I have about $34,000 in yhe build right now as it sits. Since I bought the rig new in '09 the total spend on mods has been about $42k, with the difference being upgrades to the original build, boo-boos in some of the original component choices that had to be swapped out, fine tuning the suspension performance, etc. As it is now the thing drives like a dream on highway, can wheel anywhere the big boys go, survive and make the drive home. Don't get into this thinking you can do it on the cheap, you can't.

You can do a quality (let me repeat QUALITY) 2.5" lift with 33s rather inexpensively, retain the stock driveshafts, not have to alter the front steering geometry, etc. Good kit by AEV at 2.5" with their drop brackets will drive better than stock on highway and allow you to run 33s without a regear, etc. I put one on a club memeber's rig last year and she came to Moab with us two weeks later. Ran Behind The Rocks without a stumble or a break.
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