1-3-5-6-7 Clutch Backing Plate Retaining Ring Measurement

Special Tools

• DT-47868-4  Clutch Travel Weight Adapter (Only required on some 8L90 models)
• DT-50900  Clutch Travel Support Fixture
• DT-50902  Adjustable Clutch Spring Compressor
• DT-50903  Clutch Travel Load Gauge
• DT-50905  Clutch Air Travel Adapter
• DT-50905-3  Clutch Air Travel Fixture Adapter (Required on 8L45 models)
• GE-8001  Dial Indicator Set

Equivalent regional tools: Special Tools

1. Install the 1-3-5-6-7 clutch piston and 1-3-5-6-7 clutch plates. 1-3-5-6-7 Clutch Assemble (8L45) 

2. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   • Use DT-50905-3  Clutch Air Travel Fixture Adapter for 8L45.

   Assemble the tools as shown, and clamp the DT-50900  Clutch Travel Support Fixture (2) to the bench.

3. Apply 30 pounds of pressure to the DT-50903  Clutch Travel Load Gauge (3) by turning the screw on the DT-50900  Clutch Travel Support Fixture (2) clockwise.
4. Ensure the plunger of the GE-8001  Dial Indicator Set (4) is located on the backing plate.
5. Zero out the GE-8001  Dial Indicator Set (4).
6. Remove the pressure on the DT-50903  Clutch Travel Load Gauge (3) by turning the screw on the DT-50900  Clutch Travel Support Fixture (2) one full turn counterclockwise.
CAUTION:

Regulate the air pressure to 345 kPa (50 psi) maximum. High pressure could cause the piston to over travel and damage the piston seals.

7. Apply 345 kPa (50 psi) of compressed air to the indicated hole on the DT-50905  Clutch Air Travel Adapter (5), and simultaneously adjust the screw on the DT-50900  Clutch Travel Support Fixture (2) to apply 30 pounds of pressure to the DT-50903  Clutch Travel Load Gauge (3).
8. Observe the dial indicator measurement. Refer to Clutch Backing Plate Retaining Ring Specifications (8L45) to determine the correct 1-3-5-6-7 clutch backing plate retaining ring (6).