How to tell the difference between Ford 8.8 and 9.75 rear end?
The Ford 8.8 and 9.75 rear ends are two of the most common rear differential designs used in Ford vehicles. While they may appear similar, there are distinct differences between the two that can help you identify which one you have. In this article, we'll explore the key distinguishing features of the Ford 8.8 and 9.75 rear ends.
Identifying the Ford 8.8 Rear End
The Ford 8.8 rear end is a popular choice for many Ford enthusiasts due to its durability and strength. Some key features that can help you identify the 8.8 rear end include:
- Diameter: The 8.8 rear end has a diameter of 8.8 inches, as the name suggests.
- Axle Tube Diameter: The axle tube diameter of the 8.8 rear end is typically 3 inches.
- Differential Cover: The differential cover on the 8.8 rear end is round in shape.
- Gear Ratio: The gear ratio of the 8.8 rear end can vary, but common ratios include 3.55, 3.73, and 4.10.
The Ford 8.8 rear end is commonly found in a variety of Ford vehicles, including the Mustang, F-150, and Ranger.
Identifying the Ford 9.75 Rear End
The Ford 9.75 rear end is another popular choice, particularly in larger Ford trucks and SUVs. Some key features that can help you identify the 9.75 rear end include:
- Diameter: The 9.75 rear end has a diameter of 9.75 inches, as the name suggests.
- Axle Tube Diameter: The axle tube diameter of the 9.75 rear end is typically 3.5 inches.
- Differential Cover: The differential cover on the 9.75 rear end is rectangular in shape.
- Gear Ratio: The gear ratio of the 9.75 rear end can vary, but common ratios include 3.73, 4.10, and 4.30.
The Ford 9.75 rear end is commonly found in larger Ford vehicles, such as the F-250, F-350, and Expedition.
Conclusion
Knowing the differences between the Ford 8.8 and 9.75 rear ends can be helpful when working on or upgrading your Ford vehicle. By understanding the key distinguishing features, you can easily identify which rear end you have and make informed decisions about any necessary repairs or modifications. Remember to always consult your vehicle's specific information and seek professional assistance if needed.
How do I identify my Ford rear differential?
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.
What year did Ford use 8.8 rear end?
Ford first used the 8.8 axle in 1983 model year trucks and is still in production for the Ford Ranger and Ford F-Series. It was also used in the Ford SUVs until Independent suspension replaced the solid axle.
What is the difference between 8.8 and 9 inch rear end?
One of the main differences between the 8.8 and the 9-inch is the pinion location. The 9-inch's pinion is offset lower on the ring gear than that of the 8.8. This low position adds strength, but it saps power and creates noise, making the 8.8 relatively silent by comparison.
What Ford vehicles have the 8.8 rear end?
8.8 Independent Rear Suspension
- 1988-1997 Ford Thunderbird.
- 1999-2004 Ford Mustang Cobra.
- 2003-2010 Ford Explorer.
- 2003-2010 Mercury Mountaineer.
- 2003-2005 Lincoln Aviator.
- 2003-2006 Ford Expedition.
- 2003-2006 Lincoln Navigator.
Do I have a 8.8 or 9.75 rear end?
Also you can tell by the diff cover shape. There's pictures online. Basically if it's symmetrical then it's the 8.8. If it's tapered on one side it's the 9.75.
How do you tell what size rear end you have?
The axle may have a sticker, and on the differential cover, you might have a small metal tag that's sticking out that will have the gear ratio stamped on it.
How can I tell if my Ford is 8 inch or 9 inch?
Because it is the right ribbing on the outside of the case. Now our 64 Falcon has its original axle in there in the center. Point.
How to identify a Ford 8.8 rear end?
Almost all 8.8s—and all post-1986 Ford rearends—have letters and numbers. The first number refers to the plant where it was built, and the next three refer to the ratio and type.
How do I know what rear end gears I have?
Rotate the marked tire one revolution while counting how many times the driveshaft rotates. eg, If your driveshaft made 3 3/4 revolutions, that would determine a 3.73 gear ratio. If you get approximately 2 3/4 revolutions, you have a 2.76 gear ratio.
What vehicles have a Ford 9.75 rear end?
Popular Applications:
| Ford F-150 | 1997 to Current | Rear |
|---|---|---|
| Ford F-150 Raptor | 2010 to Current | Rear |
| Ford Transit | 2015 to Current | Rear |
| Ford E Series Vans | 1999 - 2014 | Rear |
| Ford Expedition | 1997 - 2014 | Rear |
