Car owners may choose to swap rear ends with a GM 12-bolt rear end for a Ford 9-inch rear end for various reasons, each with its own set of pros and cons. The Chevy versus Ford debate is as old as these legendary car companies. The debate within the debate has long been GM 12-bolt versus Ford 9-inch. In truth the GM 12-bolt is a far more efficient axle than the Ford because it consumes less energy. The reason for the 12-bolt’s efficiency is the distance from the pinion gear to the ring gear’s centerline. The 12-bolt’s 1.50-inch distance offers a 3 percent horsepower advantage over the Ford’s 2.25 inches because the greater distance between the two creates greater internal friction and heat. The Ford is also a whopping 30 pounds heavier than the GM.
Despite the 12-bolt’s obvious advantages in terms of internal friction and weight, there is a reason why performance enthusiasts on all sides of the debate continue to choose the Ford 9-inch. The Ford design 9-inch has enjoyed wide availability compared to the GM 12-bolt over the years. Production of the Ford 9-inch axle began in 1957 and ended in 1986 when it was replaced with the 8.8-inch integral carrier rearend. GM did not produce as many 12-bolt axles during its shorter production life spanning from 1965 to 1981.
Here is why they might want to swap rear ends:
Reasons to Swap Rear Ends; GM 12-Bolt for Ford 9-Inch
- Strength and Durability: The Ford 9-inch rear end is renowned for its strength and durability, often considered one of the strongest rear axles available for performance applications. Car owners may opt for the Ford 9-inch to handle increased horsepower and torque levels, especially in high-performance or racing vehicles.
- Ease of Serviceability: The Ford 9-inch rear end is known for its modular design, which makes it easier to service, repair, and modify compared to some other rear axle options. It features a removable center section, allowing for straightforward gear changes and differential upgrades without needing to remove the entire axle assembly from the vehicle.
- Availability of Aftermarket Parts: The Ford 9-inch rear end has been widely used in various Ford vehicles and has a vast aftermarket support network. This availability of aftermarket parts, such as differential gears, limited-slip differentials, axles, and housing components, makes it easier for car owners to customize and upgrade their rear axle to suit their specific needs and performance goals.
- Customization Options: The Ford 9-inch rear end offers greater customization options compared to some other rear axle designs. Car owners can choose from a wide range of gear ratios, differential types (such as open, limited-slip, or locker), axle lengths, and housing configurations to tailor the rear axle to their vehicle’s specifications and intended use.
Pros and Cons of Swapping GM 12-Bolt for Ford 9-Inch
Pros:
- Strength and Durability: The Ford 9-inch rear end is often considered stronger and more durable than the GM 12-bolt, particularly in high-horsepower or high-torque applications.
- Serviceability: The modular design of the Ford 9-inch makes it easier to service, repair, and modify compared to some other rear axle options.
- Aftermarket Support: The Ford 9-inch rear end has a vast aftermarket support network, offering a wide range of aftermarket parts and customization options for car owners.
Cons:
- Cost: Swapping a GM 12-bolt for a Ford 9-inch rear end can be costly, especially when factoring in the cost of the rear axle assembly, installation labor, and any additional components or modifications required.
- Compatibility: Depending on the vehicle’s make and model, a Ford 9-inch rear end may require custom fabrication or modification to fit properly, which can add complexity and expense to the swap.
- Weight: The Ford 9-inch rear end may be heavier than the GM 12-bolt, which could affect overall vehicle weight distribution and handling characteristics, particularly in racing or performance applications where weight reduction is a priority.
Finally
Overall, car owners may opt to swap rear ends with a GM 12-bolt rear end for a Ford 9-inch rear end to take advantage of its superior strength, durability, serviceability, aftermarket support, and customization options, especially in high-performance or racing vehicles where reliability and performance are paramount. Even the most committed Chevy enthusiast will admit the Ford 9-inch is the better pick if for no other reason than convenience and a huge inventory of replacement parts. However, it is essential to carefully consider the cost, compatibility, and potential drawbacks of such a swap before proceeding.
