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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 133 (Automatic Transmission - 4L80-E/4L85-E - Introduction (2 Of 2)) >> Repair Instructions >> Repair Instructions - Off Vehicle >> Direct Clutch Piston Travel Check

Direct Clutch Piston Travel Check

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

    Fig 1: Measuring Direct Clutch Piston Travel
    GM31061Courtesy of GENERAL MOTORS CORP.
  1. Attach the J 7057  (not visible in the illustration) to the J 8001-3  . See Special Tools .
  2. Using the J 8001-1  , mount the J 8001-3  to the transmission case through the opening in the case barrel. Place the J 7057  onto the direct clutch piston assembly. See Special Tools .
  3. Index the J 8001-3  . Set the dial to 0.
  4. Apply 80 psi of air pressure to the direct clutch fluid passage (3rd/Reverse), in the case bottom, in order to actuate the direct clutch piston. Refer to Fluid Passages , Case Fluid Passages illustration.
  5. Measure the direct clutch piston travel.

    Piston Travel Specification:  The piston travel should be 1.27-4.369 mm (0.050-0.172 in).

  6. Remove the tools.
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