There isn’t a single universal size for the Ram 1500’s rear differential—the truck’s half-ton platform typically uses a rear axle with a 9.25-inch ring gear, but the exact setup—gear ratio and even the axle type—varies by year, engine, and option package.
Understanding the rear axle configuration on the Ram 1500
Because the Ram 1500 has been offered with multiple configurations over its generations, the rear differential size isn’t fixed. The standard 9.25-inch rear axle accommodates several gear ratios, and some models or years may present different axles or, in rare cases, different ring gear sizes. The only reliable way to know for sure is to check the axle label, vehicle documentation, or decode the VIN.
Ways to verify the rear differential size
Use the following steps to identify the axle size and gear ratio for your specific Ram 1500.
- Inspect the differential’s identification tag or stamped code on the rear axle. The tag often lists the gear ratio (for example, "3.21" or "3.55") and may indicate the ring-gear size. If the tag is hard to read, photograph it or clean the area to reveal the numbers.
- Check the factory documentation for your vehicle. The build sheet, original window sticker, or owner’s manual can show the axle ratio and rear axle type for your exact truck.
- Look up the VIN to decode the axle configuration. Your dealer or Ram’s official VIN decoding service can provide the specific rear axle details tied to your VIN.
- Consult a dealership or qualified mechanic if you are replacing parts or planning an upgrade. They can confirm the exact axle size for your model year and trim based on your VIN and options.
Knowing the correct rear differential size helps with towing calculations, part compatibility (like gears and lockers), and maintenance schedules.
Summary
In short, there isn’t a single fixed rear differential size for the Dodge Ram 1500. The most common configuration uses a 9.25-inch ring-gear rear axle, but the gear ratio and, rarely, the axle itself can vary by year, engine, and trim. To confirm your specific truck, check the axle tag, vehicle documentation, or use the VIN to decode the exact axle configuration. Always verify before ordering parts or attempting upgrades.
How do I know if I have 8.8 or 9.75 rear end?
Now yours could read the L9. Which is 3.75. Or 7.75 axle under yours. Also if your truck is a four-wheel drive or having a tow package most likely yours is a 9.75.
How to tell if you have a dana 60 or 70?
Luckily, it's pretty easy to tell which axle you have. The original factory axles in a Full Float Dana 60 always have 30 splines or less. If you pull an axle shaft out of your Dana and it has 33 or 35 splines, then you probably have a Dana 70.
What differential does a 5.7 hemi have?
2015-2022 Dodge Challenger R/t 5.7 Hemi Rear Differential 3.08 Diff Rwd.
How do I know what differential my Ram 1500 has?
The most accurate differential identification is provided by the bottom line of the tag number or axle tube stamp. Differential tags can easily be used to identify Dana and Ford differentials.