Strange Engineering D1556 Pro Series Lightweight Steel Spool 30 Spline Mopar 8.75

The Strange Engineering D1556 is a Pro Series lightweight steel spool designed for Mopar 8.75-inch rear ends with 30 spline axles. This high-performance differential replacement permanently locks both axle shafts together, ensuring both rear tires turn at the same speed for maximum traction in racing applications.

Key Features:

• Machined from premium 8620 forged steel for exceptional strength
• Lightened design reduces rotating weight for improved performance
• Broached for 30 spline axles with same spline locations as OEM differential
• Critical dimensions left oversize prior to heat treatment for superior durability
• Finish machined after heat treat to bring surfaces within exact specifications
• Fits 742 or 489 case applications
• Forged in the USA and machined by Strange Engineering
• Weighs 8.95 lbs

Requirements:

• 489 side bearings and races
• Non-adjustable axle bearings (Strange A1022 or A1022OB recommended)
• Spool bearings D1584 recommended for installation

This lightweight pro race spool provides a more rigid gear mounting than stock cast-iron carriers, improving ring and pinion life while eliminating common differential side gear failures. The forged steel construction offers tremendous strength advantages over factory units, making it ideal for drag racing, road racing, and other high-performance applications. Backed by Strange Engineering's Limited Lifetime Warranty.