How much horsepower can a 28 spline Ford 9-inch handle?
The Ford 9-inch rear end is a legendary component in the world of automotive performance, known for its strength and versatility. However, when it comes to determining how much horsepower a 28-spline version can handle, there are several factors to consider. In this article, we’ll explore the capabilities of the 28-spline Ford 9-inch and provide insights into its performance limits.
Understanding the 28-Spline Ford 9-Inch
The Ford 9-inch rear end is a popular choice for muscle cars, hot rods, and off-road vehicles due to its robust design and ability to handle significant power. The 28-spline version refers to the number of splines on the axle shafts, which directly impacts its strength and torque-handling capacity. While the 28-spline is the entry-level option for the Ford 9-inch, it is still a durable choice for many applications.
Horsepower Limits of the 28-Spline Axles
The 28-spline Ford 9-inch is generally capable of handling up to approximately 400-450 horsepower in most applications. However, this number can vary depending on several factors:
- Vehicle Weight: Heavier vehicles put more stress on the axles, reducing their ability to handle high horsepower.
- Traction: High-traction setups, such as drag slicks, can increase stress on the axles, potentially leading to failure at lower horsepower levels.
- Driving Style: Aggressive launches, burnouts, and other high-stress driving behaviors can push the axles beyond their limits.
- Condition of Components: Worn or damaged axles and differential components can significantly reduce the system's strength.
When to Upgrade to 31-Spline or Beyond
If you’re planning to exceed 450 horsepower or subject your vehicle to extreme conditions, upgrading to 31-spline axles or even aftermarket 35-spline axles is highly recommended. These options provide increased strength and durability, ensuring your rear end can handle the added power without failure.
Conclusion
The 28-spline Ford 9-inch is a reliable choice for moderate horsepower applications, typically up to 400-450 horsepower. However, if you’re building a high-performance vehicle or engaging in activities like drag racing, it’s wise to consider upgrading to stronger axles to ensure long-term reliability and safety. At Kevin’s Autos, we’re here to help you make the right choice for your vehicle’s needs. Contact us today for expert advice and professional installation services!
Frequently Asked Questions
Why is the Ford 9-inch so strong?
The size of the ring gear is another key element of the 9-inch's strength. At 9 inches in diameter (hence the name), it is larger than many other factory rearend options, such as the GM 10-bolt or 12-bolt rear axles, giving it a larger surface area to distribute the forces of torque.
How much horsepower can a Ford 9 inch rear end handle?
800 horsepower
QA1's Ford 9-Inch
QA1's 9-inch housing is fabricated with a focus on strength and lightweight performance, rated to handle up to 800 horsepower.
Are more splines stronger?
Generally, more splines means a larger-diameter, stronger shaft (the 14-bolt 30-spline is an exception).
What is the most popular spline size?
For standard screening material, 0.140” and 0.160” spline are the most commonly used sizes. For thicker screening products, 0.125” is the most common.
How much power can a Ford 9-inch 28 spline handle?
They're good to 800 hp, if built properly. The next step beyond that would be the high end, completely redesigned, Mark Williams billet-aluminum housing. "It's the same deal with common production 28-spline axles.
What are the benefits of the Ford 9 inch rear end?
Additionally, the 9-inch housing's strength accommodates the increased loads from more robust braking systems without compromising its integrity. Another major advantage of the 9” is its ability to accept a wide range of gear ratios, thanks to the third-member design.
How much HP can Ford 10 speed handle?
1,000 horsepower
GPZ's high torque capacity, great torque transfer capabilities and enhanced durability have enabled the 10R80 to handle upwards of 1,000 horsepower without increasing the clutch capacity by using additional friction surfaces. The 10R80 transmission platform is now more than five years old.
How much power can 30-spline axles handle?
"This will give you a figure that represents the maximum amount of torque transmitted to both axles if you launched at your engine's torque peak and dead-hooked out of the hole. A 30-spline axle is rated at 6,200 lb-ft, a 31-spline at 7,000, a 33-spline at 8,200, a 35-spline at 9,600, and a 40-spline at 12,000.
What is the diameter of a 28 spline axle?
1.2083
Axles Schmaxles
| STRENGTH COMPARISON OF COMMON O.E. AUTOMOTIVE & RACING SPLINES | ||
|---|---|---|
| # Teeth | Pressure Angle | Major Diameter |
| 28 | 45 deg | 1.2083 |
| 31 | 45 deg | 1.3333 |
| 33 | 45 deg | 1.4167 |
Is 28 or 31 spline better?
31 spline axles which are about 30% stronger than the 28 spline axles making them a popular aftermarket upgrade for Fox, SN95, and New Edge Mustang owners.
