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Old 07-16-2014, 09:31 PM   #1
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What gears do I have

How do I know what gear ratio I have? I own a 2010 JKU Sport Unlimited 3.8L.

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Old 07-16-2014, 09:38 PM   #2
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Should be a tag on your differential.

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Old 07-16-2014, 10:00 PM   #3
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http://www.chrysler.com/webselfservice/ Go to the left under "Your Vehicle" and click on equipment listing. Type in your VIN and hit search and there you go..
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Old 07-16-2014, 10:03 PM   #4
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You can also go through the Jeep site and request a copy of your build sheet from Chrysler. I did mine and had it the next day. The gears will be listed in with everything. Here is the site takes about 5 min to do.


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Old 07-16-2014, 10:06 PM   #5
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You can also go through the Jeep site and request a copy of your build sheet from Chrysler. I did mine and had it the next day. The gears will be listed in with everything. Here is the site takes about 5 min to do.


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Why wait a day when you can have it instantaneously?
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Old 07-17-2014, 01:40 AM   #6
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Quote:
Originally Posted by Sinister6 View Post
Should be a tag on your differential.
there has not been a tag on differentials for years.

get your build sheet.
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Old 07-17-2014, 04:23 AM   #7
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Just look at your window sticker
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Old 07-17-2014, 08:34 AM   #8
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Just take the diff cover off and look at the numbers on the gear.
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Old 07-17-2014, 11:20 AM   #9
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I am curious how to do this as well since I purchased my 08 JKUR used and it was already modified with lift 37" tires yadda yadda. I would have thought he would have regeared it with all the other mods done but it does feel sluggish to me coming from a 5.7L Hemi Grand Cherokee.

If I open up the pumpkin am I at risk of damaging anything by doing so? Seals? Fluid loss? Where on the gears are the numbers stamped? will I have to remove them from the diff to see them?
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Old 07-17-2014, 12:10 PM   #10
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You will loss fluid. There are a set of numbers stamped on the ring gear and that will tell you which ratio you have. You don't need to take apart the diff.
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Old 07-17-2014, 12:50 PM   #11
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Just take the diff cover off and look at the numbers on the gear.
yes, open it up, waste $40 of gear oil.

or just take 5 minutes to get your build sheet.

or jack it up and spin the shafts and do some math if OP thinks it has different gears
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Old 07-17-2014, 07:11 PM   #12
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</title> <meta content="" name="keywords"/> <meta content="" name="description"/> <title>Dodge - Contact Us Go to the left under "Your Vehicle" and click on equipment listing. Type in your VIN and hit search and there you go..
Thank you! It worked. Damn I only have 3.21 gears. Yikes!
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Old 07-17-2014, 07:18 PM   #13
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So now that I know I have 3.21 gears ....Now im in need of new gears. I was looking at Yukon 4.10s and I noticed for the front Dana 30 it states short reverse and the rear D44 doesn't say that. Do i get the short reverse for the front D30 and what does short reverse mean?
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Old 07-17-2014, 09:17 PM   #14
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alright, I have actually driven a 3.8 JK on 37's with 3.21's. I have a buddy who will spend all his money on things that make his jeep look cool instead of things that make it work. his newest creation is on 40's with 4.10's...

I guess my question is, are 5th and 6th even usable on the highway? the one I drove barely got going in 1st and 85 was accomplished by staying in 4th gear. it will be EXTREMELY noticeable that you have 3.21's, not just a little sluggish. it will barely be driveable. keep in mind that you came from a 5.7 Hemi, a 3.8 JK (or any JK for that matter) is going to be a snail in comparison.

with 37's and a 3.8, you are looking at 5.13's, not 4.10's.

you need to get gears specifically for the JK dana 30 and 44. ours are very different and every website has them specifically labeled "JK" with a subsequent markup because people will pay it.

numbers arent always stamped in the same location, the only place I could 100% say they would be is on the inner face of the pinion which you could not get to.

jack the jeep up, spin the tires, and count the driveshaft rotations. there will be a huge difference between 3.21's and something more appropriate and you dont even have to turn a wrench.

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