Suncoast SunCoast 6L80E Category 5 Transmission with Billet Converter SUNSC-6L80E-CAT5

The SunCoast 6L80E Category 5 Raybestos Rebuild Kit with Converter (MPN: SC-6L80E-CAT5) is a high-performance transmission upgrade for the GM 6L80E platform. This comprehensive kit includes a new selective pump thrust washer, filter assembly, Torrington thrust bearing kit, bushing kit, molded piston kit, and an all-new steel module. The friction components are upgraded with Raybestos GPZ high energy fibers for ultimate stress and high-temperature durability, including the 3-5 Reverse Z Pak and 4-5-6 Z Pak, which are redesigned single-sided clutch systems offering superior torque and heat capacity. The kit also features a SunCoast Overhaul Kit, new pan gasket, and a Sonnax Zip Kit to address critical circuit pressure losses. For enhanced durability, it incorporates a heavy-duty 4-5-6 backing plate setup, a billet 1-2-3-4 apply piston, and a 3-5-R apply ring. Key upgrades include a billet pump rotor, a triple disc billet torque converter, a billet 4-5-6 intermediate shaft and hub, and a 6L80E rear planetary assembly. The billet 4-5-6 intermediate shaft and hub are a one-piece design made from ultra high-strength 300M billet steel, heat-treated, and shot-peened to prevent shaft breakage and clutch failure, doubling oil flow to the clutches for improved heat resistance. The 6L80E rear planetary assembly is redesigned with a 4140 HTSR billet steel drive plate to eliminate spline/housing failure. The included SunCoast triple-disc torque converter features a heavy-duty forged billet steel cover, stronger Chromoly steel turbine and impeller hub, custom upgraded sprag cartridge, woven Carbon Fiber clutch material, furnace brazed turbine and pump fins, Torrington roller bearing construction, and a custom CNC'd billet 4140 billet cover, billet stator cap, and billet apply piston. It comes with a 3-year unlimited mileage warranty. This kit is recommended for high-stress, performance applications, heavy-duty vehicles, and commercial vehicles. It addresses common 6L80E transmission failure points and is designed for modified engines with increased power output.