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Axle ratio?

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Old 05-29-2017, 11:59 AM   #1  
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Axle ratio?

Pretty sure I have 3.73's. How can I tell from the VIN? Tried some free VIN check sites, but mostly just general info.
Thanks
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Old 05-29-2017, 12:43 PM   #2  
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Use the vin decoder on this site. It is in the menu bar at the top of the page under tools. Once you have entered your vin look under the Equipment tab. It should be the first thing listed.
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Old 05-29-2017, 01:55 PM   #3  
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If your under 2k rpm at 70 mph you have them
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Old 05-29-2017, 02:30 PM   #4  
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If you have a 13+ and a 2500 you have 3.42
We need your year and 2500/3500. If it's a 10-12 then it can be a 3.73.
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Old 05-29-2017, 06:54 PM   #5  
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Originally Posted by ptm600 View Post
Use the vin decoder on this site. It is in the menu bar at the top of the page under tools. Once you have entered your vin look under the Equipment tab. It should be the first thing listed.
I did this, and the first line had 3.73 Axle Ratio with a green check mark. This must have been a special order?
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Old 05-31-2017, 03:36 PM   #6  
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I did this, and the first line had 3.73 Axle Ratio with a green check mark. This must have been a special order?
Most trucks prior 2013 came with the 3.73's.
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Old 05-31-2017, 05:44 PM   #7  
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Yeah, I knew that. Most HD diesel pickups from all 3 makes used to have 3.73 gears. thought the new ones came standard with 3.42's. That's why I'm wondering if this is correct
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Old 05-31-2017, 06:33 PM   #8  
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2013 and up 2500 is only 3.42, it's been a heavily discussed issue on the net. Even vin decoders and window stickers may even list 3.73/4.10 but somewhere else on the sheet it will list 3.42.
Long story short 2013+ 2500 is a 3.42 unless you regear yourself.
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Old 06-01-2017, 11:23 AM   #9  
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Quote:
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Yeah, I knew that. Most HD diesel pickups from all 3 makes used to have 3.73 gears. thought the new ones came standard with 3.42's. That's why I'm wondering if this is correct
Be sure and fill out your signature so we're not guessing what you have
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Old 06-05-2017, 03:32 PM   #10  
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Yep, 3.42's are all you can get in a 2500 Cummins. Not sure why FCA went that way. Most will use these pickups for towing, and in mountains a lower gear ratio would be better. Also if you go to bigger tires.
For a minuscule improvement in fuel mileage when running unloaded?
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Old 06-05-2017, 06:42 PM   #11  
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Yes and when you can still pull off an over 17k tow rating why not. Don't get me wrong I believe you should be able to order whatever rear you want, but I guess they figure if they can max you out with the 3.42 no need for the 3.73 or 4.10 in a 2500
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Old 06-05-2017, 08:21 PM   #12  
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Absolutely correct RyeThomas. You can still tow 17K, but you can pull it more efficiently with lower gears.
Thank you for your service.
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Old 12-01-2017, 10:22 AM   #13  
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Go to this web site.
Under "equipment listing" you type in you VIN#
You get a "build sheet" of how you truck came from the factory which list gear ratio.
https://www.dodge.com/webselfservice/dodge/
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Old 12-01-2017, 07:17 PM   #14  
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I had a '93 dodge with 3.55 gears and now an '04 with 3.73 gears

Both trucks do/did 2000rpm at 110kmh

Tire size was the difference. slightly larger diameter tire on the '04




I'm guessing they are manipulating gear sets to hit a target RPM with a certain tire package....
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