Removal Procedure

Tools Required 

• J 7872 Magnetic Base Indicator Set. See Special Tools and Equipment .
• J 23327 Clutch Spring Compressor. See Special Tools and Equipment .

1. Use a J 7872  in order to measure the forward clutch piston stroke before disassembly.
   1. 1.1. Temporarily install the direct clutch assembly onto the fluid pump (2) and the forward clutch assembly into the direct clutch assembly.
   2. 1.2. Place the J 7872  plunger on the forward clutch piston and apply 392-785 kPa (57-114 psi) of compressed air into the forward clutch apply passage on the fluid pump.
   3. 1.3. Standard forward clutch piston stroke should fall within 1.420-1.810 mm (0.0559-0.0713 in).
   Fig 1: Measuring Forward Clutch Piston Stroke Using Compressed Air

   Courtesy of GENERAL MOTORS CORP.
2. If a correct reading cannot be obtained, remove the forward clutch assembly from the direct clutch assembly. Apply 392-785 kPa (57-114 psi) of compressed air into the forward clutch assembly passage (1) on the input shaft (2) and observe the J 7872  .
3. If the forward clutch piston stroke is greater or less than specified, inspect all direct clutch components for excessive wear.
   Fig 2: Applying Compressed Air To Forward Clutch Assembly Passage On Input Shaft

   Courtesy of GENERAL MOTORS CORP.
4. Remove the three input shaft seal rings (2) from the input shaft (1).
   Fig 3: Removing Input Shaft Seal Rings

   Courtesy of GENERAL MOTORS CORP.
5. Remove the forward clutch snap ring (2) from the forward clutch drum (1).
   Fig 4: Removing Forward Clutch Snap Ring

   Courtesy of GENERAL MOTORS CORP.
6. Remove the following components from the forward clutch drum (1):
   • The forward clutch flange
   • Four discs
   • Four plates
   Fig 5: Removing Flange, Discs & Plates From Forward Clutch Drum

   Courtesy of GENERAL MOTORS CORP.
7. Use the J 23327  and a hydraulic press to remove the forward clutch piston return spring snap ring (1) from the forward clutch piston return spring retainer.
8. Remove the forward clutch piston return spring from the forward clutch piston.
   Fig 6: Removing Forward Clutch Piston Return Spring Snap Ring

   Courtesy of GENERAL MOTORS CORP.
9. Remove the forward clutch piston (1) from the forward clutch drum (2) by applying low pressure compressed air into the forward clutch apply passage on the input shaft.
10. Remove the two forward clutch piston seals from the forward clutch piston.
11. Clean all the forward clutch components and dry thoroughly.
12. Inspect the forward clutch discs for excessive wear or damage. Replace the discs as necessary.
13. Inspect the forward piston for cracks or porosity. Replace the piston as necessary.
    Fig 7: Removing Forward Clutch Piston

    Courtesy of GENERAL MOTORS CORP.
14. Inspect the forward clutch piston check ball (1) operations by applying compressed air into the working and release sides of the forward clutch piston (2). There must be no air leakage on the working side and air must pass freely through the release side. If these conditions do not exist, replace the forward clutch piston.
15. Inspect the forward clutch piston return spring for distortion or weakness. Replace the spring as necessary.
    Fig 8: Inspecting Forward Clutch Piston Check Ball Operation Using Compressed Air

    Courtesy of GENERAL MOTORS CORP.