Performance Eng F9666LW Ford 9 Inch Ring and Pinion Gear Set 6.66 Ratio Lightened

The Performance Eng F9666LW is a high-performance ring and pinion gear set designed specifically for Ford 9-inch rear differentials. This lightened gear set features an aggressive 6.66:1 ratio, making it ideal for applications requiring maximum acceleration and torque multiplication.

Key Features:

• 6.66:1 gear ratio for exceptional off-the-line acceleration
• Lightened design reduces rotational mass for improved response
• Precision-engineered for Ford 9-inch rear end housings
• CNC-machined from high-strength alloy steel
• Heat-treated for maximum durability and wear resistance

This gear set is popular in drag racing, rock crawling, and other performance applications where extreme gear ratios are needed. The lightened construction helps reduce parasitic losses while maintaining the strength required for high-torque applications. Professional installation and proper setup with correct backlash and bearing preload is essential for optimal performance and longevity.