GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Low and Reverse Clutch Piston Housing Installation

    Object Number: 1235488 Size: SH

    Important: Except as noted, a low and reverse clutch housing, 4WD is installed using the same procedures as used when installing a low and reverse clutch housing, 2WD.

  1. Install a new gasket (2) onto the transmission case (3).
  2. For a 2WD transmission, make sure the output shaft turns with the output speed sensor (OSS) reluctor wheel. For a 4WD transmission, install the output shaft bearing spacer.
  3. Align the low and reverse clutch housing with the transmission case locating pin (4) and park pawl pin (5).
  4. Install the low and reverse clutch housing.
  5. For a 2WD transmission, turn the OSS reluctor wheel through the OSS hole to make sure the output shaft turns with the reluctor wheel.

    6. Object Number: 1235485 Size: SH
  6. Hand install 4 bolts (1).
  7. Evenly draw down bolts (1) until the low and reverse clutch housing seats on the transmission case.
  8. Hand install 12 bolts (2).

    9. Notice: Refer to Fastener Notice in the Preface section.

  9. Tighten the bolts (1) and bolts (2).

    10. Tighten
    Tighten bolts to 56 N·m (42 lb ft).