Setting up 5.38's - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 6 Old 01-25-2012, 07:09 PM Thread Starter
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Setting up 5.38's

I've made the decision that I'm going to jump to 5.38's. After researching it looks like they'll be awesome with my 35's and perfect when I jump to 37's. I'll likely go with Nitro gears through Marcus with complete overhaul kits. I'm debating whether to pay for the install or do it myself. I'm a technician at a dealer, but deal mostly with trim, AC, and electrical stuff, with some minor light line work. From what I've read, it seems like if you don't get the gears set-up perfectly the pinion will generate a lot of heat and cause premature failure due to the small size of the pinion gear. Most of the rear ends I've set-up have just been bearing and seal replacements, with a quick check of pattern to make sure everything is still within spec, so I havent done an entire overhaul. I have all the tools required to complete the job plus a 12 pack buys a lot of assistance! Anybody done a set on their own, and have any tips or tricks? I know its gonna be just like setting up any other rear end, I think im just concerned with the smaller pinion making it more difficult to get it right.

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post #2 of 6 Old 01-25-2012, 07:30 PM
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Pay for install unless you have the proper tools and experienced!

2014 Rubicon on the build!
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post #3 of 6 Old 01-25-2012, 07:32 PM
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Originally Posted by RODICON View Post
Pay for install unless you have the proper tools and experienced!
Agreed.

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post #4 of 6 Old 01-25-2012, 07:34 PM Thread Starter
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Originally Posted by RODICON View Post
Pay for install unless you have the proper tools and experienced!
I have the tools, and I have experience when it comes to factory gear sets in factory ratios.

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post #5 of 6 Old 01-26-2012, 01:52 AM
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I set up my own with out every doing it before. Its not that difficult, just time consuming and can get very frustrating having to pull and re install the carrier and pinion.
If you can pull your entire axle assembly out of your jeep it makes it much easier, this allows you to get comfortable and take your time with the install. Plus its easier to drop the carrier in and allow gravity to help you get it in there as apposed to having to lay under the jeep and fight with the carrier while its trying to fall on your face.

Here's a link to some good info on how to get your pattern set up.
http://www2.dana.com/pdf/5717.pdf

Last edited by HOT_DAMN; 01-26-2012 at 02:06 AM.
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post #6 of 6 Old 01-26-2012, 06:06 AM
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Originally Posted by snksknr94 View Post
I have the tools, and I have experience when it comes to factory gear sets in factory ratios.
If you can set up factory gears then you can set up aftermarket gears. When you order the gears it will most likely come with a little book that gives you tips on setup and give you all your tolerances. It'll show you the correct pattern and how to adjust it from there. You'll probably be just fine if not very close with the factory pinion shim so I don't think you'll fight it too much. Get your backlash between .006-.010 and you'll be in good shape.
Its not difficult like someone said above, its just time consuming. Be anal about the setup and don't short cut and say "F it, it'll be fine." The most important thing i feel in gear setup is the break it. You can have a perfect setup and if you heat those gears up to much during break in you'll ruin them.


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