99-04 Mustang GT Built Rear End

The 99-04 Mustang GT Built Rear End refers to an upgraded rear axle assembly specifically designed for the 1999-2004 Ford Mustang GT models. This aftermarket modification aims to enhance the durability, strength, and overall performance of the rear end to withstand higher power and torque levels.

The Built Rear End typically includes several upgraded components that collectively reinforce the rear axle assembly. These components may vary depending on the specific package or builder, but common upgrades often include:

Differential: The stock limited-slip differential may be replaced with a stronger and more performance-oriented unit. This helps improve traction and handling during aggressive driving or high-horsepower applications.

Axle Shafts: Upgraded axle shafts are commonly installed to handle increased torque levels. These axle shafts are typically made from stronger materials, such as chromoly steel, to provide improved strength and durability.

Ring and Pinion Gear: The gear ratio of the ring and pinion may be modified to optimize acceleration or top-end speed, depending on the desired driving characteristics. Higher-performance gear ratios can improve overall performance and responsiveness.

Differential Cover: A heavy-duty differential cover may be included to provide additional strength and improve cooling for the rear end components. These covers often have added ribbing or cooling fins to dissipate heat more effectively.

Upgraded Bearings and Seals: High-quality bearings and seals may be used to ensure smooth operation and longevity of the rear end components, particularly under high-stress conditions.

Bracing and Reinforcements: Additional bracing or reinforcement components, such as differential braces or subframe connectors, may be installed to improve chassis rigidity and handling characteristics.

The installation of a Built Rear End typically requires professional expertise and specialized tools, as it involves disassembling and reassembling various components of the rear axle assembly. It is important to follow proper installation procedures to ensure optimal fitment and performance.

Upgrading to a Built Rear End can provide several benefits, including improved durability, increased torque capacity, enhanced traction, and better overall performance. It is a popular modification among Mustang enthusiasts who seek to maximize the potential of their vehicles for high-performance applications, such as drag racing, road racing, or aggressive street driving.