Part Number: D1557
Strange Engineering
Mopar 8 3/4″ 35 Spline Steel Spool
Pro Series lightweight spool
For 742 or 489 case
Requires:
489 side bearings & races
Non-adjustable axle bearings
Features:
• Machined from 8620 forged steel
• Lightened to reduce rotating weight
• Broached 35 spline with 30° pressure angle
• Same spline locations as OEM differential
• Critical dimensions left oversize prior to heat treatment
• Heat treated for further gains in strength
• Finish machining after heat treat to bring surfaces within specifications
• Designed and machined by Strange Engineering
• Forged in the USA
Weight:
8.35 lbs
A spool is one solid part that replaces all components of a differential. The Mopar 8.75 spool fits the Mopar 8.75 Rear End. A drag racing spool will always turn both axles at the same speed with an equal amount of force. Due to the simplistic design, it is much stronger and lighter than any differential. It also allows the use of larger axles that can handle greater amounts of torque. This makes it the best choice for Drag Racing, Drifting, and other forms of motorsports that require uninterrupted transfer of power to both wheels.