Checking Servo Pin Length

Remove 4th apply piston and return spring. See Fig 1. Remove retainer ring, washer, apply pin spring and 2nd apply piston pin. Install Piston Compressor (J-22269-01) on 2nd apply piston. See Fig 2.
Remove retainer ring, cushion spring and spring retainer. Install Band Apply Pin Tool (J-33037) and apply pin. See Fig 3. Apply 100 INCH lbs. (11 N.m) torque.
White line on band apply tool should be within gauge slot if pin length is correct. If White line is not within gauge slot, inspect 2-4 band and reverse input drum for wear and damage during disassembly.
Servo pin length must be checked during reassembly. Servo pin is preset and must not be readjusted. See SERVO PIN SPECIFICATIONS table under 2-4 BAND & SERVO ASSEMBLY under TRANSMISSION REASSEMBLY .

Fig 1: Exploded View of 2-4 Servo Assembly

Courtesy of GENERAL MOTORS CORP.

Fig 2: Compressing 2nd Apply Piston

Courtesy of GENERAL MOTORS CORP.

Fig 3: Measuring Servo Pin Length

Courtesy of GENERAL MOTORS CORP.