Strange Engineering D1553 Pro Series Lightweight Steel Spool Ford - 31-Spline 9

The Strange Engineering D1553 is a Pro Series lightweight steel spool designed for Ford 9-inch rear axles with 31-spline axle shafts. This full-size spool locks both axle shafts together, forcing the rear tires to turn at the same speed for maximum traction in drag racing and motorsports applications.

Key Features:

• CNC-machined from 8620 forged steel for exceptional strength and durability
• Lightened design reduces rotating weight to 8.50 lbs
• Heat-treated for additional strength gains after initial machining
• Broached for 31-spline axles with same spline locations as OEM differential
• Fits 2.891" or 3.062" bore cases without modification
• Provides more rigid ring gear mounting than stock differential
• Forged in the USA and backed by a limited lifetime warranty

Installation Notes:

• Requires the use of spool bearings (D1586 for 2.891" bore or D1588 for 3.062" bore, sold separately)
• C-clip eliminators recommended but not required
• Designed for drag racing, drifting, and motorsports use only—not recommended for street applications

Strange Engineering's Pro Series spools eliminate gear failure caused by case deflection and differential side-gear failure, making them a trusted choice for serious racers demanding consistent performance and reliability.