"Maximum Duty" Straight Cut Planetary Gears Only - 9 Clutch Super Drum, 1.80 Ratio

"MAXIMUM DUTY" STRAIGHT CUT PLANETARY GEARS ONLY, COMPLETE SET W/ HEAT TREATED RING GEAR AND BILLET SPLINED REACTION FLANGE FOR 9 CLUTCH SUPER DRUM, 1.80 RATIO

The Coan Racing COA‑12787B “Maximum Duty” Straight-Cut Planetary Gear Set for 9-Clutch Super Drum (1.80 Ratio) is a top-tier gear assembly engineered specifically for high-performance GM Powerglide applications. Designed to integrate seamlessly with Coan’s 9-clutch Super Drum, this complete kit includes precision-machined straight-cut gears, a heat-treated ring gear, and a billet splined reaction flange, all optimized for the aggressive 1.80 low-gear ratio. Crafted to immense strength and tight tolerances, each component is built to endure the extreme torque loads of drag racing, bracket competition, or street/strip performance builds.

As a drop-in solution, the COA‑12787B installs directly into Powerglide cases compatible with the 9-clutch Super Drum configuration without modification, delivering precise gear engagement, reduced power loss, and enhanced drivetrain response. Whether refreshing a race-ready transmission or upgrading a high-torque build, this "Maximum Duty" gear set provides the toughness, alignment precision, and reliability needed for confident, performance-driven operation.