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Old 02-07-2015, 07:56 PM   #1
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Rear axle gear ratio question, no, it is not what you think!

Gang,

We are in the process of purchasing a used- obviously- 2012 Ram 2500 diesel.

The outfit does not have the original build sheet and the dealer seems incapable of finding out what the differential gear ratio is.

Mind you, this thing, even with 3:49 (or whatever) is fully capable of pulling our 2014 27ft International, however, for you experts out there, those more mechanically inclined than I, is there any way to determine what the rear end gear ratio is? Is it somehow reflected in VIN or???

Thanks.
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Old 02-07-2015, 08:10 PM   #2
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The parts or service dept should be able to run a build sheet. Any Dodge dealer can do it. All you need is the vin. Jim
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Old 02-07-2015, 08:15 PM   #3
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Quote:
Originally Posted by LOGRIDER View Post
is there any way to determine what the rear end gear ratio is? Is it somehow reflected in VIN or???
Dealer can get the build sheet. You can contact Dodge if you have the VIN.
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Old 02-07-2015, 08:15 PM   #4
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If the Dodge dealer you are dealing with can't run the build sheet, it's time to "run" from that dealer. Basic ratio is 3.42 but it could be lower. You will have enough power to pull your trailer in any case.
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Old 02-07-2015, 08:27 PM   #5
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Guys, there is a better way. Go here: Ram Trucks - Recall

Click the link on the left hand side of the page that says EQUIPMENT LISTING

Enter your VIN and you will get a build sheet in PDF format.

We bought used, and this is how we verified our truck was 3.92 and had 32 gallon tank.
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Old 02-07-2015, 10:34 PM   #6
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I just crawled under my 2015 Ram. The axle ratio was printed on a label on the bottom of the axle.
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Old 02-07-2015, 10:39 PM   #7
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There is a tag on the rear housing cover with the gear ratio and some other numbers, most likely 3.73 , good ratio ,I would like to try a 3.54. Either one is good...
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Old 02-08-2015, 04:21 AM   #8
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Depending on configuration it can only be one of 3 options. 3.42 - 3.73 or 4.10

http://www.ramtrucks.com/shared/pdf/..._Tow_Chart.pdf

I'd pass on 3.42 and aim for 3.73 or 4.10 depending on how you'll tow.

When it came to the half tons, the majority we looked at had the lower 3.21 gearing and some where 3.55. Took lots of looking to find one with 3.92 and the larger fuel tank. But we got it done using the vin reference I posted above.

The gearing is based on the transmission in the truck. Also, as stated it is usually stamped on the axle, but not all. Mine doesn't have it stamped on ours for axle. You win some, you loose some. But the Vin thing is always 100%.
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Old 02-08-2015, 07:41 AM   #9
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Hey there logrider, don't get dirty while under the pickup looking at the tag on the axle housing which is on one of the bolts of the rear cover, we will be in oceanio about the first of April, to see my old friend Mr Beck, will try to remember to get in touch,you will like the dodge...,
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Old 02-08-2015, 08:05 AM   #10
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Quote:
Originally Posted by CBWELL View Post
If the Dodge dealer you are dealing with can't run the build sheet, it's time to "run" from that dealer. Basic ratio is 3.42 but it could be lower. You will have enough power to pull your trailer in any case.
In the dealer's defense, they are not an actual Dodge dealership but rather a independent. Nevertheless thanks to the suggested web site proffered by Bold Adventure, with the VIN, now I know everything there is to know about the oufit..I love this forum...a lot of knowledge out there, if you just know who to ask.
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Old 02-08-2015, 08:22 AM   #11
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My Ford has an axle-type indicator on the sticker that is on the driver's door frame. Maybe yours has the same?
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Old 02-08-2015, 12:53 PM   #12
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The higher number more pulling power less economy lower top speed unless 3.71 4.10 etc. as dif. manf. have dif. ratios. High #s. for small horse power engine, unless you are going to move a house then you would need higher #s. I have been pulling all kinds of trailers & wghts. for well over 60 yrs. never had to specify high # rear axle, always had high horse power engines.
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Old 02-08-2015, 03:40 PM   #13
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On subject with this post but TV is a F150 4x4 super cab Ecoboost, will be picking up our new 25' FC on Tuesday and asking the same question. What is your average electric bake controller setting or is it about the same 5 to 6 as most of the post suggest for the F250 and larger.

Thanks
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Old 02-08-2015, 03:41 PM   #14
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Sorry fellas ask my question on the wrong post site.
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