Strange S-Series Steel Spool is designed specifically for GM 8.5 rear ends with 33-spline axles, providing durability and reliability for high-performance racing applications. Crafted by Strange Engineering, this steel spool ensures even power distribution to the wheels, enhancing traction for consistent and powerful launches. Engineered to handle extreme conditions, the S-Series Spool is an ideal upgrade for drag racing enthusiasts seeking maximum performance. Compatible with 33-spline axles and requiring part D1585, this spool offers a strong and dependable solution for racing vehicles needing improved traction and stability.