Performance Eng CSFS37031 9 Inch Full Spool 3.70 Gear Ratio 31 Spline

The Performance Eng CSFS37031 is a full spool center section designed for 9-inch Ford rear axle applications. This heavy-duty spool completely locks both axle shafts together for maximum power transfer and traction, making it ideal for racing and high-performance drag applications where differential action is not needed.

Key Features:

• Full spool design eliminates differential gears for direct power transfer to both wheels
• 3.70:1 gear ratio provides excellent balance of acceleration and top-end speed
• 31-spline configuration for compatibility with heavy-duty axle shafts
• Engineered for 9-inch Ford rear end housing
• New center section for reliable performance and durability
• Precision-machined construction for proper gear mesh and alignment

This spool is designed for dedicated race vehicles and off-road applications where turning characteristics of a standard differential are not required. The full spool design ensures both rear wheels turn at the same speed at all times, delivering maximum traction for straight-line acceleration.