Strange Engineering D1526 S-Series Steel Spool GM 12 Bolt 30-Spline

The Strange Engineering D1526 S-Series Steel Spool is a high-performance differential replacement designed for Chevrolet 12-bolt passenger car rear ends with 30-spline axles. This full-size steel spool permanently locks both axles together, ensuring both rear wheels turn at the same speed for maximum traction in drag racing, drifting, and other motorsports applications.

Key Features:

• Manufactured from 8620 forged steel for superior strength and durability
• Broached for 30-spline axles with splines in stock OEM location
• Final turn operation performed after heat treatment to ensure accuracy
• Designed for 4-series carriers with 12-bolt cover pattern
• Easy changeover from OEM differential units
• Lighter than many competition lightweight spools while maintaining strength
• Forged in the USA and machined by Strange Engineering

Application: GM 8.875-inch (12-bolt) passenger car rear ends

Requirements: Requires a C-clip eliminator kit (Strange A1033) or aftermarket housing ends, and gear set designed for 4-series carrier. Spool bearings (Strange D1582) and installation kit (R5211) recommended.

Strange Engineering S-Series spools provide a more rigid gear mounting than stock cast-iron differential carriers, improving ring and pinion life while eliminating common rear end problems caused by carrier deflection or differential side gear failure. This spool is ideal for competitive racing applications where maximum power transfer and durability are critical.