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We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.

What gear ratio do I have

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Is there a way to find out what gear ratio my truck's diff has? I know I could call a dealer with the VIN but I was wondering if there was any other way.

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You can look in the glove box and find the axle ratio on the information sheet on the door, or you might find it on the radiator support under the hood.

  • Owner

You can look in the glove box and find the axle ratio on the information sheet on the door, or you might find it on the radiator support under the hood.

Yeah he's right... post-2-138698173435_thumb.jpg

This is what you should be at. The orange is RPM the top row shows the gear your in, then the ratio, then the MPH..

This is with 265/75/16's.

Here is what it should run with 3.55's

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Here is what it should run with 4.10's

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Thanks:thumbup2: by the looks of ISX's chart I have 3.55's

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Welcome To Mopar1973Man.Com LLC

We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.