Feature FITMENT: Works on these Rear Clutch Spring Compressor – GM – 250, 250C, 350, 350C, 4L60E (1993 – 2017); 4L65E (2001 – 2017); 4L70E (2001 – 2017); TH700-R4 (1982 – 1993) FUNCTION: Use to remove the Low/ Reverse clutch piston in the rear of the case. ADVANTAGE: Makes removing the clutch spring retainer easy and save your time, the whole process takes just a few minutes OPERATION: Make the tool engages the lugs and pushes the piston return spring enough to access the snap ring. .