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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1781 (Automatic Transmission Overhaul - 4 Speed-Mu4) >> Repair Instructions >> Forward Clutch Assembly Installation >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

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 overtheating on first time engagement.
  1. Install the new forward clutch piston seals (1) onto the forward clutch piston (2).
  2. Apply J 36850  to the new forward clutch piston seals.
    Fig 1: Installing Forward Clutch Pistons Seals
    G01384890Courtesy of GENERAL MOTORS CORP.
  3. Install the forward clutch piston (1) into the forward clutch drum (2) with the cup side facing upwards.
  4. Install the forward clutch piston return spring onto the forward clutch piston.
    Fig 2: Installing Forward Clutch Piston
    G01384891Courtesy of GENERAL MOTORS CORP.
  5. Use J 23327  and a hydraulic press to install the forward clutch piston return spring snap ring (2) onto the forward clutch piston return spring retainer.
    Fig 3: Installing Forward Clutch Piston Snap Ring
    G01384892Courtesy of GENERAL MOTORS CORP.

    Important:  The forward clutch flange must be installed with the flat side facing down and the stepped portion facing upwards.

  6. Install the four forward clutch discs (2), the four forward clutch plates (3) and the forward clutch flange (1) into the forward clutch drum in the following order:
    • One forward clutch plate
    • One forward clutch disc
    • One forward clutch plate
    • One forward clutch disc
    • One forward clutch plate
    • One forward clutch disc
    • One forward clutch plate
    • One forward clutch disc
    • The forward clutch flange
    Fig 4: Identifying Forward Clutch Disc & Plate Installation Sequence
    G01384893Courtesy of GENERAL MOTORS CORP.
  7. Install the forward clutch snap ring into the direct clutch drum.
  8. Install three new input shaft seal rings onto the input shaft.
  9. Apply J 36850  to the new input shaft seal rings.
  10. Use the J 7872  to measure the forward clutch piston stroke after completing assembly.
    1. 10.1. Place the J 7872  plunger on the on the forward clutch piston and apply 392-785 kPa (57-114 psi) of compressed air into the forward clutch apply passage (1) on the input shaft (2) and observe the J 7872  .
      Fig 5: Measuring Forward Clutch Piston Stroke Using Compressed Air
      G01384894Courtesy of GENERAL MOTORS CORP.
    2. 10.2. The standard forward clutch piston stroke should fall within 1.420-1.810 mm (0.0559-0.0713 in).
    3. 10.3. If the forward clutch piston stroke is greater or less than specified, and all forward clutch components exhibit little or no wear, select one of the following different forward clutch flange sizes to bring the forward clutch piston stroke within specification:
      • 2.80 mm (0.110 in)
      • 3.00 mm (0.118 in)
      • 3.20 mm (0.126 in)
      • 3.370 mm (0.1327 in)
      • 3.600 mm (0.1417 in)