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Old 05-21-2011, 06:05 AM   #1
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Prepping for new 37's

Ok, I will be putting 37's onto my '08 JKU in the very near future. I plan on running Nitto Trail Grap 37x12.5x17's.

What are the steps I need to take to make sure I do everything I can make sure it is done properly.

1. 4" lift installed
2. 1" BL being installed
3. Just ordered EVO C's & sleeves.
4. Will be ordering 5.13's or 5.38's this week...still cant choose which one

I would like to beef up the brakes as well, but not sure how soon I can do that.

What else should I be planning to do to ensure the best transition as possible??

This is my DD as well.

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Old 05-21-2011, 06:16 AM   #2
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I would pick up a spare set of axle shafts.

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Old 05-21-2011, 07:04 AM   #3
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If I remember right you have a Auto. 5.38's would be preferable for 37's but unless you have a D44 axle up front (rubicon) then you have to get 5.13's for D30 front (non rubicon). The only 5.38's that I have ever heard of for dana 30 axles is those cheap foreign sets which I would never buy. You want the best when going to 37's. So make sure to buy USA made gears like Yukon.
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Old 05-21-2011, 07:37 AM   #4
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Quote:
Originally Posted by rics1997 View Post
If I remember right you have a Auto. 5.38's would be preferable for 37's but unless you have a D44 axle up front (rubicon) then you have to get 5.13's for D30 front (non rubicon). The only 5.38's that I have ever heard of for dana 30 axles is those cheap foreign sets which I would never buy. You want the best when going to 37's. So make sure to buy USA made gears like Yukon.
Good memory, I do have an AUTO, but I have a Rubi & 44's front & rear.

Just a FYI for those with the 30 up front Yukon now makes 5.38's for the 30. A bunch of different online retailers have them & they go for around $310
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Old 05-21-2011, 08:05 AM   #5
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Thats a big bago-worms you're opening up, but

Thats what tha Damn jeeps are for-I wouldn't even take a chance with 5.13s--
I'd (I have) get a full set of YUKON 5.38s/w and full Master installation kits and Lubelocker gaskets-

If you find that the 37s are too much for a lotta reasons--the 5.38s will be OK for 35s too-

Good luck

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Old 05-21-2011, 08:16 AM   #6
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I'd like to add maybe you should look at upgrading your axle shafts to chromolly's.. Not cheap but should pay off if your gonna go to 37's
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Old 05-21-2011, 09:11 AM   #7
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Quote:
Originally Posted by JIMBOX View Post
Thats a big bago-worms you're opening up, but

Thats what tha Damn jeeps are for-I wouldn't even take a chance with 5.13s--
I'd (I have) get a full set of YUKON 5.38s/w and full Master installation kits and Lubelocker gaskets-

If you find that the 37s are too much for a lotta reasons--the 5.38s will be OK for 35s too-

Good luck

JIMBO
Thanks Jimbox,

Are you running 37's currently? What are the biggest issues you have found if so...
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Old 05-21-2011, 09:13 AM   #8
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Originally Posted by XJ Knight View Post
I'd like to add maybe you should look at upgrading your axle shafts to chromolly's.. Not cheap but should pay off if your gonna go to 37's
Do you think thats necessary? I do wheel it pretty often, but not extremely hard...no big rocks or anything like that....most trails & mudding for me here on the east coast.
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Old 05-21-2011, 10:12 AM   #9
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Heh Heh, nope-I'm running Big 33.6" hankooks and I've awakened a sleeping giant in this 3.8L-


Quote:
Originally Posted by SolarStar View Post
Thanks Jimbox,

Are you running 37's currently? What are the biggest issues you have found if so...
I've got lotta additional power and off-road I can cruise in 4hi, where I used to have to stay in 4lo (auto)-

The mileage is unbelievable and even though this jeep isn't a DD--it could be-

I'm afraid that by using 37" tires/5.38 gears, you're almost back to "stock" performance/power/mileage--

I'd giveit a lotta thought !!

Take a minute and read thru this-

http://www.wranglerforum.com/f33/re-...ons-92903.html

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Old 05-21-2011, 10:18 PM   #10
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Quote:
Originally Posted by SolarStar View Post
Ok, I will be putting 37's onto my '08 JKU in the very near future. I plan on running Nitto Trail Grap 37x12.5x17's.

What are the steps I need to take to make sure I do everything I can make sure it is done properly.

1. 4" lift installed
2. 1" BL being installed
3. Just ordered EVO C's & sleeves.
4. Will be ordering 5.13's or 5.38's this week...still cant choose which one

I would like to beef up the brakes as well, but not sure how soon I can do that.

What else should I be planning to do to ensure the best transition as possible??

This is my DD as well.
Are you running flat flares? If not then you might want to add bumpstops specially if you gonna wheel it.

I got 4" lift,flat flares,35s and i slightly rub at full stuff before i added bumpstops.I will be going 37s soon since i slashed my tires good after todays wheeling but im ready for it since i added 4" rear and 2" front bumpstops.

Also a programmer to calibrate your speedo.

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