Suncoast Converters 300M Alloy Input Shaft 12-7/8 - Turbo Splines COA-12802

The Coan Racing COA‑12802 300M Alloy Input Shaft (Turbo Spline, 12-7/8″) is a premium, high-strength replacement shaft engineered for GM Powerglide transmissions with turbo-style splines. Crafted from 300M alloy, this shaft is renowned for its outstanding tensile strength and wear resistance, ensuring durability even under extreme torque conditions. It fits seamlessly into units configured for low-gear ratios spanning 1.69 all the way to 2.03, offering broad compatibility without modification. Whether you’re building a high-horsepower street car or a competitive drag setup, the COA‑12802 delivers robust performance, long-lasting reliability, and a direct-fit upgrade path for turbo-spline Powerglide assemblies.