Suncoast Converters Ultimate XST Lock-Up Kit w/ 1-1/4 29 Spline Input Shaft Complete Aluminum Pump COA-22880-AL-LU

The Coan Racing COA‑22880‑AL‑LU “Ultimate XST Lock‑Up” Kit is a premium front-end transmission package designed for high-performance Turbo Hydramatic 400 builds using XST-style torque converter systems. This all-in-one kit includes a rugged 1-1/4″, 29-spline input shaft engineered for maximum strength, paired with a complete aluminum pump assembly featuring a 32 spline heat-treated bolt-in stator, matched to support lock-up converter operation. The package also includes a 7075 billet aluminum forward drum capable of housing up to nine friction plates, providing a lightweight yet durable foundation for aggressive power handling. Crafted in the USA to Coan’s exacting XST specification, the kit simplifies installation by dropping directly into stock TH400 cases, without the need for machining. Its hardened components and adjustable hydraulics ensure firm, consistent line pressure and reliable converter lock engagement, even under demanding drag, bracket, or pro-street conditions. Designed as a complete front-end system, the COA‑22880‑AL‑LU delivers enhanced torque control, durability, and responsiveness, providing performance builders with everything needed to support XST-driven power without compromise.