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Old 06-28-2015, 06:47 PM
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What gears do I have?

So I've looked at the door stickers and in my owner's manual, but I can't find anything that tells me what gears I have on my wrangler. Can someone tell me how to figure this out?

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Old 06-28-2015, 06:53 PM   #2
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You can send to Chrysler for your build sheet, just need your VIN. The build sheet contains a plethora of information about the vehicle as shipped from the factory.

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Old 06-28-2015, 06:54 PM   #3
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Enter your VIN here: https://jeep.custhelp.com/app/jeep/e...WGxOMmc2T2w%3D

Or look for the metal tag on your rear differential.

Do you have a Rubicon? If yes, you have 4.10.

Do you have MAX tow package? If yes, you have 3.73.
If no...3.21.
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Old 06-28-2015, 07:18 PM   #4
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The last year that ratio tags were installed on the rear diff, was 2006 on the TJ's.

Just call a Dealer and give them your serial number and they will confirm your ratio!!!!!
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Old 06-28-2015, 07:29 PM   #5
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Quote:
Originally Posted by FloridaRunner View Post
Enter your VIN here: https://jeep.custhelp.com/app/jeep/e...WGxOMmc2T2w%3D

Or look for the metal tag on your rear differential.

Do you have a Rubicon? If yes, you have 4.10.

Do you have MAX tow package? If yes, you have 3.73.
If no...3.21.

Rubicon autos come with 3.73 standard. Best thing for the OP to do is use the VIN to get the build sheet via the URL.
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Old 06-28-2015, 07:32 PM   #6
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The last year that ratio tags were installed on the rear diff, was 2006 on the TJ's.

Just call a Dealer and give them your serial number and they will confirm your ratio!!!!!
This. Or, you can review your build sheet with the link that FloridaRunner provided to see what axle ratio your JK came with from the factory. No tags on JK diffs. The only thing etched in stone is 07-11 Rubicons will all have 4.10's. 12-15 manual Rubicons will all have 4.10's. 12-15 auto Rubicons will have 3.73's unless 4.10's were added as an option. Max tow packages will have 3.73's, however, Rubicon rules apply. Non Rubicons will not have 4.10's and they weren't optional, except in 07. The standard gear ratio is 3.21, except for Rubicons. 3.73's are optional for all JK's except Rubicons.
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Old 06-29-2015, 05:16 PM   #7
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Originally Posted by Willys_Freak View Post
Rubicon autos come with 3.73 standard. Best thing for the OP to do is use the VIN to get the build sheet via the URL.
Thanks for the info. I'm new to the JK side so there's a lot of things that changed.
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Old 06-29-2015, 09:16 PM   #8
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Another quick option is set on level surface, chock the front wheels, put in neutral, jack up one rear wheel, spin tire one revolution and see how many times the drive shaft rotates. Just over 4 turns - 4.10:1, little under 4 turns 3.73:1, just over 3 turns 3.21:1.
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Old 06-29-2015, 09:33 PM   #9
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Another quick option is set on level surface, chock the front wheels, put in neutral, jack up one rear wheel, spin tire one revolution and see how many times the drive shaft rotates. Just over 4 turns - 4.10:1, little under 4 turns 3.73:1, just over 3 turns 3.21:1.
A couple of things to note with that method.

- You'll have to rotate the tire 2 full rotations and count the number of driveshaft rotations. One wheel spinning = DS rotates half as much.

- This will be difficult or won't be doable if there's an LSD in the diff

Personally, looking up the VIN on the Jeep/Chrysler site is much easier but doing the tire rotation trick gets the job done if the Jeep has been modified and you have no idea what's in there.
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Old 06-29-2015, 10:36 PM   #10
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Did you buy the Jeep new, or order it? If so, nothing would have changed since it was built and the above methods would work. However, if you bought it used, the previous owner may have put steeper gears in it and not disclosed that.

An easy way to check for yourself at home is to jack up and block the rear end. Put the tansmission in a neutral gear so the rear wheels will spin. Then, put a chalk mark on the tire. Also put a chalk mark on the rear drive shaft. Have someone slowly turn the tire one complete turn, and you count the number of times the driveshaft goes around. If, for example, you have 3.21:1 gearing, the driveshaft will turn almost 3 1/4 times for each revolution of the tire.

Common gear sets are 3.21 (stock in Sport models), 3.73, 4.11 and 4.56.
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Old 06-29-2015, 10:38 PM   #11
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Good catch, forgot about only getting half spin w/one wheel, and the LSD slipped my mind, maybe I'm getting old
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Old 06-30-2015, 07:35 AM   #12
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The easiest way to tell is simply to drive it. DO NOT USE OD. Get it up to 60 mph and look at the tachometer. 2400-2500 rpm's means 3.73's. closer to 2000 rpm's and it has 3.21's. Anything over 2500 rpm's is 4.10's.

I'd still request a build sheet to confirm, and I'd not trust a dealer. Most are clueless and were probably selling refrigerators last month.
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Old 06-30-2015, 08:08 AM   #13
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The easiest way to tell is simply to drive it. DO NOT USE OD. Get it up to 60 mph and look at the tachometer. 2400-2500 rpm's means 3.73's. closer to 2000 rpm's and it has 3.21's. Anything over 2500 rpm's is 4.10's.

I'd still request a build sheet to confirm, and I'd not trust a dealer. Most are clueless and were probably selling refrigerators last month.
Only if you are on stock wheels
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Old 06-30-2015, 08:25 AM   #14
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You guys are all forgetting the most direct method. Pull the cover and count the teeth
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Old 06-30-2015, 09:22 AM   #15
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Only if you are on stock wheels
What if you put bigger tires on stock wheels?
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Old 07-02-2015, 01:09 AM   #16
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This might be considered a silly question, but I have a '15 JKUR with the max trailer package.
Does the Rubi 4.10 override the packages 3.73?
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Old 07-02-2015, 09:05 AM   #17
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This might be considered a silly question, but I have a '15 JKUR with the max trailer package. Does the Rubi 4.10 override the packages 3.73?
if you have a manual trans it's 4.10s. If you have a auto it can either be 4.10 or 3.73.
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Old 07-02-2015, 09:52 AM   #18
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This might be considered a silly question, but I have a '15 JKUR with the max trailer package.

Does the Rubi 4.10 override the packages 3.73?


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Originally Posted by 15RubieJK View Post
if you have a manual trans it's 4.10s. If you have a auto it can either be 4.10 or 3.73.

It should also be noted that there is no max tow for the Rubicon, only the tow package with hitch and wiring since all Rubicons come with the same gears as the max tow at a minimum.

So, there's no need to worry about one package overriding the other.

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