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Home >> Pontiac >> 2006 >> Vibe Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Automatic Transmission - Mu4 - Overhaul) >> Repair Instructions >> Underdrive Clutch Assembly Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
CAUTION: Wear safety glasses in order to avoid eye damage.
NOTE: When installing new clutch discs in the 1st-reverse brake, forward clutch or direct clutch assemblies, the new clutch discs MUST be soaked in Dexron® - III automatic transmission fluid GM P/N 12341643, or equivalent, two hours prior to installation. This causes the clutch material on the discs to permeate with fluid which will aid in ease of assembly and prevent clutch overheating on first time engagement.
IMPORTANT: When using compressed air to remove components, air pressure should not exceed 98 kPa (14 psi).
    Fig 1: Identifying Underdrive Clutch Piston Seals
    GM165194Courtesy of GENERAL MOTORS CORP.
  1. Install the two underdrive clutch piston seals (1) onto the underdrive clutch piston (2).
  2. Apply J 36850  to the new underdrive clutch piston seals.
    3. Fig 2: View Of Underdrive Clutch Piston
    GM165195Courtesy of GENERAL MOTORS CORP.
  3. Install the underdrive clutch piston (1) into the underdrive clutch drum (2).
  4. Install the underdrive clutch piston return spring and the underdrive clutch piston return spring into the underdrive clutch piston.
    5. Fig 3: Installing & Removing Underdrive Clutch Piston Return Spring Snap Ring With J 23327 & J 37279
    GM415848Courtesy of GENERAL MOTORS CORP.
  5. Use a J 23327  with a J 37279  to install the underdrive clutch piston return spring snap ring onto the underdrive piston return spring (2). See Special Tools .
    6. Fig 4: Locating Underdrive Clutch Flange, Discs & Plates
    GM165186Courtesy of GENERAL MOTORS CORP.
  6. Install the 4 discs, 4 plates and underdrive clutch flange into the underdrive clutch drum (1) in the following order:
    • 1 plate
    • 1 disc
    • 1 plate
    • 1 disc
    • 1 plate
    • 1 disc
    • 1 plate
    • 1 disc
    7. IMPORTANT: The underdrive clutch flange must be installed with the flat side facing down and the stepped portion facing upwards.
  7. Install the flange.
  8. Install the underdrive clutch snap ring into the underdrive clutch drum.
    9. Fig 5: View Of Underdrive One-Way Clutch Sprag Assembly & Retainers
    GM165199Courtesy of GENERAL MOTORS CORP.
  9. Install the underdrive one-way clutch sprag assembly (3) and retainers (2, 4) into the underdrive one-way clutch outer race (5).
    10. Fig 6: Rear Thrust Plate Into Underdrive One-Way Clutch Outer Race
    GM165200Courtesy of GENERAL MOTORS CORP.
  10. Install the rear thrust plate (2) onto the underdrive one-way clutch outer race (1).
    11. Fig 7: View Of J 7872
    GM165175Courtesy of GENERAL MOTORS CORP.
  11. Use a J 7872  to measure the underdrive clutch piston stroke after assembly. See Special Tools .
  12. Place the underdrive clutch drum (1) on the underdrive clutch drum support in the transaxle case and the J 7872  plunger on the underdrive clutch piston. See Special Tools .
    13. Fig 8: Checking Underdrive Clutch Piston Stroke By Blowing Air Into Passage
    GM165178Courtesy of GENERAL MOTORS CORP.
  13. Apply 392 to 785 kPa (57 to 114 psi) of compressed air into the underdrive clutch apply passage (1) in the transaxle case and observe the J 7872  . See Special Tools .
    • The standard underdrive clutch piston stroke should fall within 1.500 to 1.900 mm (0.0590 to 0.0748 in).
    • If the underdrive clutch piston stroke does not fall within specification, select one of the two following underdrive clutch flange sizes to bring the underdrive clutch piston stroke within specification:
      • 2.040 mm (0.0803 in)
      • 2.400 mm (0.0945 in)
    • Remove the old underdrive clutch drum support seal rings from the underdrive clutch drum support.
    14. Fig 9: Checking Underdrive One-Way Clutch Rotation
    GM165171Courtesy of GENERAL MOTORS CORP.
  14. Inspect the underdrive one-way clutch after assembly by placing the underdrive one-way clutch onto the rear of the underdrive clutch drum, holding the underdrive clutch drum stationary and rotating the underdrive one-way clutch.
    • The underdrive one-way clutch (1) should turn freely in a counterclockwise direction (2) and should not turn in a clockwise direction (3).
    • If the underdrive one-way clutch is installed correctly on the underdrive clutch drum and the underdrive one-way clutch can be turned clockwise, replace the underdrive one-way clutch.
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