Sonnax 10-clutch drum 28756-01 is optimized for Powerglide performance applications. Using the patented 10-clutch drum system, the drum and piston accept 10 frictions and 10 steels, increasing lockup surface to allow significantly more torque than modified OE drums. The drum features a piston bore that is .060" deeper for greater piston travel than was available from 10-clutch drum 28755-01 discontinued. * Drum holds 10 .060" frictions and 10 .060" thick steels* Excess material removed from high-strength, cast steel drum to reduce rotating mass* Accepts 24- or 12-tooth steels* Use with clutch piston [28765-05] and a 10-clutch hub with lightening holes [28304-01] or without [28304-02]