GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Transmission/Transaxle 🢒 Manual Transmission - Medium Duty 🢒 Rear Oil Seal Replacement

Removal Procedure

Tools Required

    • J 3453 Holding Bar
    • J 8614-01 Holding Bar
    • J 22834-A Rear Retainer Seal Installer
  1. Drain the transmission oil. Refer to Transmission Oil Changing .
  2. Remove the propeller shaft. Refer to the proper procedure:
    3. • The one piece propeller shaft:
       -  Propeller Shaft Replacement - One Piece - Flange Type
       -  Propeller Shaft Replacement - One-Piece - Yoke Type
    • The two piece propeller shaft:
       -  Propeller Shaft Replacement - Two Piece - Flange Type
       -  Propeller Shaft Replacement - Two Piece - Yoke Type
    • The three piece propeller shaft:
       -  Propeller Shaft Replacement - Three Piece - Flange Type
       -  Propeller Shaft Replacement - Three Piece - Yoke Type
    • The four piece propeller shaft:
       -  Propeller Shaft Replacement - Four Piece - Flange Type
       -  Propeller Shaft Replacement - Four Piece - Yoke Type
  3. Remove the parking brake from the transmission, if necessary. Refer to Park Brake Lever Assembly Replacement .
  4. Remove the speed sensor harness, as required.

    5. Object Number: 199874 Size: SH
  5. Remove the yoke nut, if necessary. Use the J 3453 or the J 8614-01 (1) in order to hold the yoke.
  6. Remove the companion flange or yoke, as required.

    7. Object Number: 199857 Size: SH
  7. Remove the screws (4), the nuts (1), and the washers (5), if used, from the rear bearing cover.
  8. Remove the rear bearing cover and gasket.
  9. Remove the oil seal, using a suitable puller.
  10. Clean the gasket material from the gasket surfaces.
  11. Clean the rear bearing cover with clean solvent.
  12. Inspect the gasket surface for scratches and nicks.
  13. Inspect the seal surface for the following conditions:
    14. • Scratches
    • Rust
    • General wear
  14. Inspect the bearing retainer for damage.

Installation Procedure

    Object Number: 199852 Size: SH

    Important: The seal lip must face toward the transmission.

    The seal must not be cocked or distorted.

  1. Install a new seal using the J 22834-A .
    2. • Coat the outside edge with sealing cement.
    • Coat the seal lip with transmission oil.

    Object Number: 199857 Size: SH
  2. Install a new gasket and bearing cover (2).

    3. Align the oil passages in the rear bearing cover and the transmission case.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the screws (4) or nuts (1) to the rear bearing cover.

    4. Tighten
    Tighten the screws or nuts to 33 N·m (24 lb ft).

  4. Install the companion flange or yoke.

    5. Object Number: 199874 Size: SH
  5. Install the flange or yoke nut. Use the J 3453 or the J 8614-01 (1) in order to hold the yoke, as required.

    6. Tighten
    Tighten the flange or yoke nut to 441 N·m (325 lb ft).

  6. Install the speed sensor harness.
  7. Install the parking brake to the transmission. Refer to Park Brake Lever Assembly Replacement
  8. Install the propeller shaft. Refer to the proper procedure:
    9. • The one piece propeller shaft:
       -  Propeller Shaft Replacement - One Piece - Flange Type
       -  Propeller Shaft Replacement - One-Piece - Yoke Type
    • The two piece propeller shaft:
       -  Propeller Shaft Replacement - Two Piece - Flange Type
       -  Propeller Shaft Replacement - Two Piece - Yoke Type
    • The three piece propeller shaft:
       -  Propeller Shaft Replacement - Three Piece - Flange Type
       -  Propeller Shaft Replacement - Three Piece - Yoke Type
    • The four piece propeller shaft:
       -  Propeller Shaft Replacement - Four Piece - Flange Type
       -  Propeller Shaft Replacement - Four Piece - Yoke Type
  9. Fill the transmission with transmission oil. Refer to Transmission Oil Changing .