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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1739 (Automatic Transmission - ALLISON - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> 1-2-3-4 Clutch Piston Inspection

1-2-3-4 Clutch Piston Inspection

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Inspecting 1-2-3-4 Clutch Piston For Damage
    GM2088919Courtesy of GENERAL MOTORS CORP.
  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.

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

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