"EXTREME DUTY" PLANETARY, SHORTY, STEEL CARRIER, BILLET BOLT-ON OUTPUT SHAFT, STRAIGHT CUT GEARS, 1.69 RATIO

The Coan Racing COA‑12758C “Extreme Duty” Planetary Assembly (Shorty, 1.69 Ratio) is a top-tier internals package designed specifically for GM Powerglide transmissions built with shorty cases. Precision-engineered with a rugged steel carrier and straight-cut gears, this assembly delivers consistent gear meshing and superior strength under high-torque conditions, ideal for competitive drag racing or high-horsepower street applications.

Integrated with a billet bolt-on output shaft, it allows for easy servicing and adds robustness to the output connection without requiring case modifications. Engineered to the 1.69 low-gear ratio, this planetary set offers enhanced torque multiplication compared to standard ratios and installs as a drop-in unit for a clean, no-hassle upgrade. Whether refreshing a short Powerglide for serious performance or building a dedicated strip unit, the COA‑12758C provides unmatched durability, precision alignment, and race-winning capability in a compact package.