Installation Procedure

Tools Required 

• J 36850 Transjel® Transmission Assembly Lubricant. See Special Tools and Equipment .
• J 23327 Clutch Spring Compressor. See Special Tools and Equipment .
• J 37282 Interdrive Brake Piston Return Spring Compressor. See Special Tools and Equipment .

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 the 2 new seal rings onto the underdrive clutch drum support (2).
   Fig 1: Installing Seal Rings Onto Underdrive Clutch Drum Support

   Courtesy of GENERAL MOTORS CORP.
2. Apply J 36850  in order to the two new underdrive brake piston seals.
3. Apply J 36850  in order to the two new underdrive clutch drum support seal rings (3).
4. Install the underdrive brake piston (1) into the transaxle case with the cup side facing upwards.
   Fig 2: Installing Underdrive Brake Piston

   Courtesy of GENERAL MOTORS CORP.
5. Install the underdrive brake piston return spring (1) into the transaxle case.
   Fig 3: Installing Underdrive Brake Piston Return Spring

   Courtesy of GENERAL MOTORS CORP.
6. Install the underdrive brake flange (2), three plates (3) and three discs (1) into the transaxle case in the following order:
   • Plate
   • Disc
   • Plate
   • Disc
   • Plate
   • Disc
   • Flange
   Fig 4: Identifying Underdrive Brake Flange, Discs, & Plates Installation Sequence

   Courtesy of GENERAL MOTORS CORP.
7. Align the inner teeth of the underdrive brake discs (2).
   Fig 5: Aligning Inner Teeth Of Underdrive Brake Discs

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8. Install the J 23327  with the J 37282  into the transaxle case and compress the underdrive brake piston return spring until the underdrive brake piston return spring snap ring can be installed.
9. Install the underdrive brake snap ring into the transaxle case.
10. Remove the J 37282  and the J 23327  from the transaxle case.
11. Measure the underdrive brake assembly (1) using a J 7872  . Apply 392-785 kPa (57-114 psi) of compressed air into the underdrive brake apply passage (2).
    • Verify that the underdrive brake assembly clearance falls within 1.07-2.05 mm (0.0421-0.0807 in).
    • If the underdrive brake assembly clearance does not fall within specification, inspect the underdrive brake assembly for excessive wear.
    Fig 6: Measuring Underdrive Brake Assembly Clearance Using Compressed Air

    Courtesy of GENERAL MOTORS CORP.