GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Transmission 🢒 Automatic Transmission - Allison 🢒 Main Shaft Cleaning and Inspection

    Object Number: 1217381 Size: SH

    Important: Replace the main shaft if the specifications are not met.

  1. Inspect the main shaft pilots for damage.
  2. Measure the main shaft pilots at dimension A.

    3. Specification
    The main shaft pilot minimum outside diameter is 19.987 mm (0.7869 in).

  3. Inspect the main shaft journal contact area for damage.
  4. Measure the main shaft journal contact area at dimension B.

    5. Specification
    The main shaft journal minimum diameter is 36.405 mm (1.4333 in).