The Sonnax 10-clutch system increases lockup surface in GM Powerglides for significantly more torque capacity than modified OE drums. The drum kit includes 10 .060" frictions and 10 .060" thick , 24-lug steels, increasing lockup surface to allow significantly more torque than modified OE drums.
Sonnax 10-clutch drum kit with bearing 28756-08K is a complete drum kit that includes all high clutch related components, including a pump-to-drum bearing and shim, plus a pre-installed, PTFE-coated bushing. The Sonnax drum has material removed for the kit's bearing, allowing overall stack up to be .060" taller than an OE drum alone.

Patented drum, hub and piston system improves clutch capacity for maximum durability
24-Lug steels feature turbulator holes and optional rubber seperators.
High-strength drum with reduced rotating mass improves on-track acceleration
6061 Forged piston will not crack like cast pistons
Forged chromoly clutch hub guarantees your power makes it to the wheels