2-4 Servo (4L60-E): Disassembly

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Tools required: Piston Remover (J-22269-01), Band Apply Pin Tool (J-33037), and Piston Remover (J-22269-01).

Remove the following parts:
- 4th apply piston.
- Servo return spring.
- Retainer ring.
- Washer.
- Spring.
- 2nd apply piston pin.
See Figure and Figure .
Install the piston remover to compress the second apply piston. Remove the second apply piston retaining ring. Remove the servo cushion spring retainer and the servo cushion spring. Remove the seals from the cover, the housing and the pistons. See Figure and Figure .
Check the case servo bore for damage and sharp edges. Clean all the parts using solvent. Air dry all the parts.
Inspect the pistons for porosity and damage. Inspect the seal grooves for damage. Inspect the cover for porosity and damage. Inspect for nicks, cuts and binding in the seal grooves.
If damage is found, check for the cause of the damage. Inspect the springs for kinks and bending. Inspect the pin for wear and burrs.