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Old 09-29-2012, 01:15 AM   #1
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VIN Number To Identify Gear Ratio ???

Providing the Jeep's rear end hasn't been changed out, is it possible to identify the gear ratio (3.21, 3.73, etc.) from the VIN?

If so, it would sure eliminate some of the possibilities when searching for a Jeep. Before you even think about going to look at a particular Jeep, you'd know whether or not if it had the rear end gearing you were looking for.

I ask this because I called a local used car dealer today, and asked what ratio the rear end had. He didn't have a clue.

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Old 09-29-2012, 01:29 AM   #2
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Usually if it hasn't been touched there should be a tag on the differential showing the differential

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Old 09-29-2012, 01:30 AM   #3
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Quote:
Originally Posted by tjike
Usually if it hasn't been touched there should be a tag on the differential showing the differential
Oops showing the gear ratio.
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Old 09-29-2012, 01:30 AM   #4
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Just tell them to look at the axel and check what the plate says, if its still the stock gears it should still be there. With an aftermarket regear your on your own on that one. Best of luck with the new jeep hunt
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Old 09-29-2012, 01:44 AM   #5
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http://www.compnine.com/vid.php
This seems to work pretty good, it's a VIN decoder. And as for the axles it has... Here is a picture, take your pick!!

Attachment 164600
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Old 10-24-2012, 01:37 PM   #6
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Usually if it hasn't been touched there should be a tag on the differential showing the differential
What if it has? The previous owner of my 05 lifted it and added 31's. After getting hit the rear axle and assembly was damaged, and they replaced the whole thing. My shit points feel different, like I am having to shift earlier... also feels like is has slightly less get up and go then it did before they made the switch.
I am wondering if the P.O. had also changed the ratio to better work with the 31's...
Would there still be a tag there? The shop gave me the tag from the unit, it is at home, but if they changed gears, would they have changed tags, or left the original tag on?
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Old 10-24-2012, 01:45 PM   #7
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You can use the VIN to order a free Build Sheet and it will tell you what the gearing was from the Plant. For instance my Build Sheet says "DMFP 4.10 Rear Axle Ratio"

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Old 10-24-2012, 01:59 PM   #8
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What if it has? The previous owner of my 05 lifted it and added 31's. After getting hit the rear axle and assembly was damaged, and they replaced the whole thing. My shit points feel different, like I am having to shift earlier... also feels like is has slightly less get up and go then it did before they made the switch.
I am wondering if the P.O. had also changed the ratio to better work with the 31's...
Would there still be a tag there? The shop gave me the tag from the unit, it is at home, but if they changed gears, would they have changed tags, or left the original tag on?
Ask the shop what gears they put in. but if you have 2 different gears in the front than the rear i dont think you can put it in 4wd without breaking things.
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Old 10-24-2012, 02:06 PM   #9
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If you remove the diff cover and count the teeth on the ring gear and divide it by the number of teeth on the pinion gear that will give you your gear ratio. There is also another way of doing it by counting rotations of the drive shaft and tire but not to sure how to do that and not sure if it works on the front too.
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Old 10-24-2012, 02:32 PM   #10
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Thanks for the replies. Should I try to gently put it in 4wd?
The full summary is this:
I got hit on the freeway, sent into the divider wall @ 65 mph. Body was fine but the front axle and basically everything it was connected to was trashed, so they replaced it all. I am assuming with stock parts according to my VIN#. A month goes by and I pull into my driveway and the guy behind me stops and tells me my drivers side rear wheel has a slight wobble to it. I check it and he is right. Upon closer inspection I notice that the passenger side rear wheel is out further than the drivers side... so I call my insurance and bring it back to the shop. The shop confirms that the axle is bent and the housing damaged and as a result of the bent axle the gears were worn. So they replaced everything based on the Vin#.

So, I don't know if any gears up front were replaced with the front axle (I will ask). but, I do know that they were replaced in the rear.
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Old 10-24-2012, 02:50 PM   #11
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DO NOT PUT IT INTO 4WD if you dont know that the ratios are the same. There are ways to test both front and rear to find out their ratio, even without counting teeth.

read this
FAQ - How do I determine my gear ratio? - JeepForum.com


CTX-Ross read the actual question before posting.
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Old 10-24-2012, 03:19 PM   #12
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Originally Posted by homebrwd View Post
DO NOT PUT IT INTO 4WD if you dont know that the ratios are the same. There are ways to test both front and rear to find out their ratio, even without counting teeth.

read this
FAQ - How do I determine my gear ratio? - JeepForum.com
Thanks! I will not try that then. My guess is that they left the gears up front, but replaced them in the rear. I will look at the tag they gave me when I get home tonight.
The tough part is that the shop doing the work is a body shop... they have mechanics too, but it is not a 4wd specific shop. =/
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Old 08-31-2013, 10:36 AM   #13
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i have a 2012 wrangler sport jk and it has 3:21 gears im truing to find either 3:73 ring and pinion gears or 4:10 any suggestions because right now w 31'' tires this thing is a slug!!!! i put a bumper and fixing to put a lift but it wont pull itself w all that i dont think can someone tell me where to go for this
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Old 09-01-2013, 03:11 AM   #14
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Originally Posted by turnstyle View Post
Thanks! I will not try that then. My guess is that they left the gears up front, but replaced them in the rear. I will look at the tag they gave me when I get home tonight.
The tough part is that the shop doing the work is a body shop... they have mechanics too, but it is not a 4wd specific shop. =/
They are not going to put a "new" tag on it

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