GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Chevrolet W-Series Commercial W4 (W3500/W4500) 🢒 Transmission 🢒 Automatic Transmission - 4L80-E/4L85-E 🢒 Low and Reverse Band Servo Assembly Disassemble

    Object Number: 40598 Size: SH
  1. Remove the low and reverse band servo piston seal (66) from the low and reverse band servo piston  (65).
  2. Inspect the low and reverse band servo piston seal (66) for nicks and cuts.

    3. Object Number: 40599 Size: SH
  3. Remove the low and reverse band servo piston pin retainer ring (64).
  4. Remove the low and reverse band servo piston pin (73).
  5. Inspect the low and reverse band servo piston pin (73) for wear.

    6. Object Number: 40600 Size: SH
  6. Remove the low and reverse band servo piston spring retainer (72).
  7. Remove the low and reverse band servo piston spring (71).
  8. Inspect the low and reverse band servo piston spring (71) for distortion.
  9. Remove the low and reverse band servo piston spacer (87).

    10. Object Number: 40601 Size: SH
  10. Remove the 1-2 accumulator piston (68).
  11. Remove the low and reverse accumulator piston oil seal rings (67, 69).
  12. Remove the 1-2 accumulator piston spring assembly (88).
  13. Inspect the low and reverse band servo piston (65) and the 1-2 accumulator piston (68) for porosity and damage.
  14. Inspect the low and reverse accumulator piston oil seal rings (67, 69) for nicks and cuts.