1.80 "Extreme Duty" Planetary, Shorty

"EXTREME DUTY" PLANETARY, SHORTY, STEEL CARRIER, BILLET BOLT-ON OUTPUT SHAFT, STRAIGHT CUT GEARS, 1.80 RATIO

The Coan Racing COA‑12760A “Extreme Duty” Planetary Assembly (Shorty, 1.80 Ratio) is a race-grade driveline component engineered for GM Powerglide transmissions built with shorty cases. Constructed around a rugged steel carrier and equipped with straight-cut planetary gears, it delivers exceptional strength and precision under extreme torque loads, ideal for drag racing setups and high-performance street applications.

A standout feature is the billet bolt-on output shaft, which provides reinforced output support and simplifies servicing without requiring internal teardown. Designed to the aggressive 1.80 low-gear ratio, this assembly offers faster torque multiplication and installs as a direct-fit unit with shorty cases, requiring no machining or case modifications. Whether upgrading for maximum performance or building a short Powerglide for bracket-style competition, the COA‑12760A gives you uncompromised durability, race-ready specification, and pinpoint internal alignment in a compact package.