Automatic Transmission Clutch Spring Compressor Automatic Transmission Clutch Spring Compressor This is a handy, adjustable tool for removing or installing the snap ring on a transmission rear clutch piston. It applies pressure to the clutch drum’s retaining washer to compress piston return springs.. For use on most American cars and light trucks. No. 7024 – Automatic transmission clutch spring compressor. 7024 No -