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How to tell what differential you have on a Ford Ranger?

Determining the type of differential in your Ford Ranger is an important step in maintaining and servicing your vehicle. The differential is a crucial component that distributes power from the transmission to the wheels, and knowing the specific differential can help you choose the right fluids, parts, and repair procedures. In this article, we'll guide you through the process of identifying the differential in your Ford Ranger.

Locate the Differential

The first step is to locate the differential on your Ford Ranger. The differential is typically located between the rear wheels, either in the rear axle housing or in a separate housing. You may need to get under the vehicle or refer to your owner's manual to pinpoint the exact location.

Inspect the Differential

Once you've located the differential, you'll need to inspect it to determine the type. Look for any identifying marks, such as a tag or label, that may indicate the differential type. If there are no visible markings, you can try to identify the differential by its physical characteristics:

Gear Type: The differential may have a ring and pinion gear set, which is a common type found in many vehicles, including the Ford Ranger.

Gear Ratio: The gear ratio is typically stamped on the differential housing or cover. This can help you determine the specific type of differential.

Differential Cover: The shape and design of the differential cover can also provide clues about the type of differential.

If you're still unsure, you can consult your Ford Ranger's service manual or contact a local Ford dealership or mechanic for assistance.

Determine the Differential Type

Once you've inspected the differential, you can determine the type. Common differentials found in Ford Rangers include:

Standard Differential: This is the most basic type of differential, typically found in rear-wheel-drive vehicles.

Limited-Slip Differential: This type of differential provides improved traction by allowing the wheels to spin at different speeds, but with some resistance to prevent excessive wheel slip.

Locking Differential: A locking differential is designed to provide maximum traction by locking both rear wheels together, ensuring they turn at the same speed.

Knowing the specific type of differential in your Ford Ranger will help you maintain it properly and ensure that you use the correct fluids and parts when servicing or repairing the vehicle.

How do I know what rear differential is in my Ford Ranger?

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.

How do I find out what differential I have?

You can find your differential information by checking the differential's metal tag or a stamp on the axle tube, which often lists the gear ratio and axle type. If that's not an option, check for the RPO or axle code on the door jamb sticker, or perform a manual gear ratio test by rotating a rear wheel and counting the driveshaft turns.
Method 1: Check the identification tag or stamp

Locate the tag: Look for a small metal tag or stamp under a differential cover bolt or on the axle tube itself.
Read the code: The bottom line of the tag or stamp contains important information like the gear ratio, part number, and more. You can use the code to look up your specific differential.

This video shows how to find a differential tag: 58sChris DukeYouTube · Nov 22, 2016
Method 2: Use the vehicle's codes

Check the door jamb sticker: Find the sticker on the door jamb or the door itself. It should have an RPO (Regular Production Option) or a specific axle code listed, which you can then look up online.
Use a VIN decoder: Enter your vehicle's VIN into an online decoder. Some will include the gear ratio in the Vehicle Descriptor Section (VDS).

Method 3: Perform a manual test

Lift the rear wheels: Use a jack to lift the rear wheels off the ground.
Mark the driveshaft and wheel: Place a mark on the driveshaft and another on one of the tires.
Rotate the wheel: Put the vehicle in neutral and have a helper hold the other rear wheel still, or use a jack stand if you are alone. Rotate the wheel and have a helper count how many times the driveshaft turns.
Calculate the ratio: The gear ratio is approximately the number of driveshaft rotations multiplied by two. For example, if the driveshaft rotates 2.42.42.4 times, the ratio is approximately 4.8∶14.8 colon 14.8∶1.

This video demonstrates how to perform a manual gear ratio test: 58sBent Motorsports OffroadYouTube · Sep 22, 2023
Method 4: Visual identification (if the above fail)

Count cover bolts: The number of bolts holding the differential cover on is a key identifier (e.g., 10-bolt, 12-bolt).
Note the cover shape: Different manufacturers and models have distinct cover shapes.
Check ring gear bolts: The number of bolts holding the ring gear together is another indicator.

This video explains visual identification of a differential based on cover bolts: 1mYukon Gear & AxleYouTube · Oct 3, 2017

Does the VIN number tell you the gear ratio?

You may be able to tell the gear ratio from a vehicle's VIN by using an online VIN decoder, though not all manufacturers include this information in the VIN itself. If the gear ratio is included, it will likely be in the Vehicle Descriptor Section (VDS), which are the 4th through 8th digits of the VIN. For many vehicles, a sticker on the driver's side door jamb or on the vehicle's build sheet or owner's manual is a more reliable way to find the gear ratio.
How to check the VIN

Use an online VIN decoder: Enter the full VIN into a free online decoder. Some manufacturers have their own decoders, such as Mopar's decoder.
Look for the gear ratio code: Some VINs will have a code within the VDS that represents the gear ratio (e.g., "3731").
Consult the manufacturer: If the VIN decoder doesn't provide the information, contact the vehicle manufacturer for assistance.

Other methods to find the gear ratio

Check the vehicle sticker: Look for a sticker on the driver's side door jamb or on the vehicle's build sheet. This sticker often contains detailed information about the vehicle's equipment, including the axle ratio.
Look at the differential: Some differentials have a metal tag with the gear ratio stamped on them, or there may be a sticker on the axle itself.
Consult your owner's manual: The owner's manual or other paperwork from the vehicle's purchase often lists the gear ratio.

How do I know if I have a 3.73 or 4.10 gear?

And since we live in the day and age of 2025. Uh if you're curious. You can easily. Google you know uh the number of teeth on a ring gear.

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.