Tools Required

SA9179NE  Dial Indicator

Fig 1: Inspecting The 1st Clutch & Coast Clutch
Courtesy of GENERAL MOTORS CORP.
1. Inspect the 1st clutch (715) and the coast clutch (712) pistons to include each piston's check valve. If the clutch piston's check valve is stuck, falls out of the piston or otherwise damaged, replace the clutch piston.
Fig 2: Coast Clutch Piston Spring & Washer Plate
Courtesy of GENERAL MOTORS CORP.
2. Verify that the coast clutch piston spring washer plate (711) is staked to the coast clutch piston (712). If not, replace the coast clutch piston assembly.
Fig 3: Inspecting Clutch Piston Spring Retainer Cap & Retaining Ring For Damage
Courtesy of GENERAL MOTORS CORP.
3. Check the clutch piston spring retainer cap (709) and retaining ring (708) for wear or damage.
Fig 4: Inspecting Steel Clutch Plates, Clutch Fiber Plates & Clutch Backing Plates For Damage
Courtesy of GENERAL MOTORS CORP.
4. Inspect all of the steel clutch plates (703) and (707), clutch fiber plates (702) and (706), and clutch backing plates (701) and (705) for the following:
   • If the clutch steel plates are worn, damaged or severely discolored, replace the plates as a complete set.
   • If the clutch fiber plates are worn, damaged, or discolored, replace the plates as a complete set.
   • If the 1st clutch (701) or the coast clutch backing plate (705) is worn, damaged, or severely discolored, inspect the clutch backing plate-to-top-disc clearance, then replace the clutch-backing-plate making sure to use the correct selective size backing plate.
5. Inspect the clutch plates (703) for phase difference.