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Home >> GMC >> 2007 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 892 (Automatic Transmission - 4L80-E/4L85-E - Introduction (2 Of 2)) >> Repair Instructions >> Repair Instructions - Off Vehicle >> Low and Reverse Band Servo Assembly Disassemble

Low and Reverse Band Servo Assembly Disassemble

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Inspecting 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: Locating Low & Reverse Band Servo Piston Pin
    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: Identifying Low & Reverse Band Servo Piston Spring
    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: Inspection Points On Low & Reverse Accumulator Piston Oil Seal Rings
    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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