Strange Engineering D1555 Pro Series Lightweight Steel Spool 35 Spline Ford 9 Inch

The Strange Engineering D1555 is a Pro Series lightweight steel spool designed for Ford 9-inch rear ends with 35 spline axles. This high-performance spool locks both axle shafts together, forcing rear tires to turn at the same speed for maximum traction in drag racing, drifting, and other motorsports applications.

Key Features:

• Machined from 8620 forged steel for exceptional strength
• Lightened design to reduce rotating weight and improve performance
• Broached 35 spline with 30° pressure angle
• Same spline locations as OEM differential for easy installation
• Critical dimensions left oversize prior to heat treatment
• Heat treated for further gains in strength
• Finish machined after heat treat to bring surfaces within specifications
• Forged in the USA

Application Details:

• For Ford 9-inch rear ends
• 35 spline configuration
• Requires 3.250-inch bore aftermarket case
• Weighs 8.20 lbs
• Compatible with Strange D1590 spool bearings

This spool provides a more rigid ring gear mounting than a traditional differential, eliminating gear failure caused by case deflection or differential side-gear failure. Backed by a limited lifetime warranty, the D1555 is designed and machined by Strange Engineering for race-proven reliability. Note: Spools are intended for racing applications only and should not be used on street vehicles.