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Looking to upgrade your Ford’s rear end? One of the most popular options is the 31 spline axle, known for its strength and durability. But how do you identify if your Ford already has a 31 spline axle? Here are some tips to help you out.
What is a 31 Spline Axle?
The term “31 spline” refers to the number of splines on the axle shaft. Splines are the grooves that allow the axle to mesh with the differential gears. The more splines, the stronger the axle. A 31 spline axle has 31 splines, making it stronger than the factory 28 spline axle found in many Ford vehicles.
Check the Axle Tag
One way to identify a 31 spline axle is to check the axle tag. This is a metal tag located on the rear axle that contains information about the axle, including the gear ratio and whether it’s a limited slip or open differential. Look for a code that begins with “V” or “W”. These codes indicate that the axle is a 31 spline.
Count the Splines
If you can’t find an axle tag or want to verify the information, you can count the splines on the axle shaft. Remove the rear cover on the differential and turn the axle shaft until you can see the splines. Use a ruler to count the number of splines. If you count 31, you have a 31 spline axle.
Look for Special Markings
Some Ford rear axles have special markings that indicate they are 31 spline. For example, the Ford 9-inch rear axle may have a “9” cast into the center section, followed by “N” or “W”. The “N” stands for “nodular” and the “W” stands for “wide”. Both of these options include a 31 spline axle shaft.
Check the Vehicle’s Build Sheet
If you have access to the vehicle’s build sheet, you can look for information about the rear axle. The build sheet is a document that lists all of the options and features that were included on the vehicle when it was built. Look for an option code that indicates a 31 spline axle.
Now that you know how to identify a 31 spline axle, you can make an informed decision about upgrading your Ford’s rear end. Remember, a stronger axle means better performance and greater reliability.
People Also Ask:
Q: What is the difference between a 28 spline and a 31 spline axle?
A: The difference is the number of splines on the axle shaft. A 31 spline axle has 31 splines, while a 28 spline axle has 28 splines. The 31 spline axle is stronger and more durable than the 28 spline axle.
Q: Can I upgrade my Ford to a 31 spline axle?
A: Yes, it’s possible to upgrade your Ford to a 31 spline axle. However, it may require some modifications to the housing and other parts of the rear end. It’s best to consult with a professional mechanic or performance specialist before making any modifications.
Q: What vehicles use a 31 spline axle?
A: Many Ford vehicles use a 31 spline axle, including the Mustang, F-150, and Expedition. However, not all models and years are equipped with a 31 spline axle, so it’s important to check the vehicle’s specifications before making any upgrades.
