Installation Procedure

Important:  When installing new clutch discs in the 1st - reverse brake, the underdrive brake, the underdrive clutch, the intermediate brake, the forward clutch or the direct clutch assemblies, the new clutch discs MUST be soaked in Dexron®-III Automatic Transmission Fluid GM P/N 12346143 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.

1. Install two new direct clutch piston seals (2) onto the direct clutch piston (1).
2. Apply J 36850  to the new direct clutch piston seals.
   Fig 1: Installing Direct Clutch Piston Seals

   Courtesy of GENERAL MOTORS CORP.
3. Install the direct clutch piston (2) into the direct clutch drum (1) with the cup side facing upwards.
   Fig 2: Installing Direct Clutch Piston Into Direct Clutch Drum

   Courtesy of GENERAL MOTORS CORP.
4. Install the direct clutch piston return springs (1) onto the direct clutch piston (2).
   Fig 3: Installing Direct Clutch Piston Return Springs

   Courtesy of GENERAL MOTORS CORP.
5. Use a J 23327  and a hydraulic press to install the direct clutch piston return spring snap ring (2) onto the direct clutch piston return spring retainer.
   Fig 4: Installing Direct Clutch Piston Return Spring Snap Ring Using J 23327

   Courtesy of GENERAL MOTORS CORP.

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

6. Install three discs (2), 3 plates (3) and the direct clutch flange (1) into the direct clutch drum in the following order:
   • 1 plate
   • 1 disc
   • 1 plate
   • 1 disc
   • 1 plate
   • 1 disc
   • The flange
7. Install the direct clutch snap ring into the direct clutch drum.
   Fig 5: Installing Direct Clutch Flange, Discs & Plates

   Courtesy of GENERAL MOTORS CORP.
8. Use a J 7872  in order to measure the direct clutch piston stroke after assembly is complete.
   1. 8.1. Temporarily install the direct clutch assembly (1) onto the fluid pump (2) and place the J 7872  on the direct clutch piston.
   2. 8.2. Apply 392-785 kPa (57-114 psi) of compressed air into the direct clutch apply passage of the fluid pump and observe the J 7872  .
   3. 8.3. The standard direct clutch piston stroke should fall within 1.12-1.52 mm (0.0441-0.0598 in).
   4. 8.4. If the direct clutch piston stroke is greater or less than specified, and all direct clutch components exhibit little or no wear, select one of the following direct clutch flange sizes to bring the direct clutch piston stroke within specification:
      • 2.60 mm (0.102 in)
      • 2.80 mm (0.110 in)
      • 3.00 mm (0.118 in)
      • 3.20 mm (0.126 in)
      Fig 6: Measuring Direct Piston Stroke Using J 7872

      Courtesy of GENERAL MOTORS CORP.