Suncoast Converters Super Shaft Aerospace Alloy Input Shaft 12-7/8 Shot Peened - Turbo Splines COA-12804A

The Coan Racing COA-12804A “Super Shaft” Aerospace Alloy Input Shaft (Turbo Splines, Shot-Peened, 12-7/8″) is a top-tier drivetrain upgrade designed for GM Powerglide transmissions paired with torque converters requiring turbo-style splines across various low-gear ratios (1.69, 1.76, 1.80, 1.89, 1.96, 2.03). Crafted from aerospace-grade alloy and shot-peened for enhanced surface durability and fatigue resistance, this shaft dramatically improves tensile strength and longevity under high-load conditions. Its precision-engineered turbo splines ensure accurate torque converter engagement while maintaining OEM fitment, delivering seamless installation without machining. Ideal for high-horsepower street builds or competition use, the COA‑12804A provides racers and builders with a bulletproof input shaft solution that boosts reliability, torque handling, and confidence in Powerglide transmissions.