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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4L80-E/4L85-E - Overhaul >> Repair Instructions >> Low and Reverse Band Servo Assembly Disassemble

Low and Reverse Band Servo Assembly Disassemble

    Fig 1: View Of Low & Reverse Band Servo Piston & Seal
    GM40598Courtesy of GENERAL MOTORS CORP.
  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. Fig 2: View Of Low & Reverse Band Servo Piston Pin & Retainer Ring
    GM40599Courtesy of GENERAL MOTORS CORP.
  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. Fig 3: View Of Low & Reverse Band Servo Piston Spring, Spring Retainer & Spacer
    GM40600Courtesy of GENERAL MOTORS CORP.
  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. Fig 4: View Of Low & Reverse Accumulator Piston & 1-2 Accumulator Piston Components
    GM40601Courtesy of GENERAL MOTORS CORP.
  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.
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