GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Silverado - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 1-2-3-4 Clutch Piston Inspection

    Object Number: 2088919 Size: SH
  1. Inspect 1-2-3-4 clutch piston (1) for damage. Replace the piston if damage is present.
  2. Make sure that the orifice in the 1-2-3-4 clutch piston is not restricted. Clean any debris that is restricting the orifice.
  3. Measure the orifice in the 1-2-3-4 clutch piston for the specified size. Replace the piston if the specification is not met.

    4. Specification
    The 1-2-3-4 clutch piston orifice size is 0.85-1.15 mm (0.033-0.045 in).