RTS Transmission Clutch Drum, GM PowerGlide, Steel, Drum W/Piston springs & Retainer, Kit - RTS-DDSPGPart Number: RTS DDSPG RTS Clutch Drum Kit GM Powerglide RTS Automatic transmission drums eliminate the need for steel bushings and sleeves that can expand under heat and come loose, ultimately causing transmission failure. Suitable for all applications. This drum will accept 5 6 or 7 OEM thickness frictions and steels or up to 10 thin frictions and steels.