GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Suspension 🢒 Front Suspension 🢒 Rear Spring Hanger Replacement

Removal Procedure
  1. Set the parking brake.
  2. Block the vehicle's rear wheels.
  3. Raise the frame until the front tires clear the floor.

    4. Important: Raise the frame high enough in order to allow the spring to clear the rear spring bracket when you lower the axle.

  4. Remove the front wheel if necessary.

    5. Notice: Do not use the front crossmember to support the vehicle or the crossmember may buckle.

  5. Support the frame using suitable safety stands.
  6. Support the axle with a jack.

    7. Object Number: 201719 Size: SH
  7. Remove the following components from the lower mounting brackets (7):
    8. • The nut (10)
    • The washer (9)
    • The insulator (8)
  8. Remove the shock absorbers (5) from the lower mounting brackets (7). Push the shock absorbers into the fully retracted position.

    9. Object Number: 376794 Size: SH
  9. Remove the following components from the hanger (2):
    10. • The hangar eye bolt nut (4).
    • The washers.
    • The bolt (12).
  10. Lower the axle far enough to allow the spring shackle (8) to clear the hangar and allow removal of the bracket (2).

    11. Object Number: 376795 Size: MH
  11. Remove the following components from the side member (3):
    12. • The spring hanger nuts (1, 11).
    • The washers.
    • The bolts (6,7).
    • The spring hanger (4).

    Object Number: 376792 Size: SH
  12. On vehicles equipped with the LG5 engine remove the following components:
    13. 12.1. The nuts (3, 9)
    12.2. The washers
    12.3. The bolts (1, 7)

            Important:  Remove only the nuts (8) and washers from the engine mount bolts which retain the hanger.

    12.4. Slide the hangar (5) off the engine mount bolts (13).

Installation Procedure

    Object Number: 376795 Size: MH

    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.

  1. Install the hanger (4) to the side member with the following parts:
    2. • The bolts (6, 7)
    • The washers
    • The nuts (1, 11)

    Tighten
    Tighten the spring hanger nuts to 85 N·m (63 lb ft).


    Object Number: 376792 Size: SH

    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.

  2. On vehicles equipped with the LG5 engine install the hanger (5) to the side member, sliding the hanger over the protruding engine mount bolts (13).
  3. Install the following components:
    4. 3.1. The bolts (1, 7)
    3.2. The washers
    3.3. The nuts (3, 9)
    3.4. The engine mount nuts (8) and washers

    Tighten

        • Tighten the spring hanger nuts (3, 9) to 85 N·m (63 lb ft).
        • Tighten the engine mount nuts (8) to 70 N·m (52 lb ft).

    Object Number: 376794 Size: SH
  4. Raise the spring.
  5. Guide the shackle assembly (8) into the hangar aligning the holes.
  6. Install the following components:
    7. 6.1. The bolt (12)
    6.2. The washers (3, 11)
    6.3. The nut (4)

    Tighten
    Tighten the rear spring hanger shackle assembly nut to to 330 N·m (243 lb ft).


    Object Number: 201719 Size: SH
  7. Install the washer (6) and the insulator (13) if removed.
  8. Install the shock absorber (5) into the lower mounting bracket (7)
  9. Install the following components:
    10. 9.1. The insulator (8)
    9.2. The washer (9)
    9.3. the nut (10)

    Tighten
    Tighten the lower shock absorber nut to 84 N·m (62 lb ft).

  10. Install the front wheel if removed.
  11. Lower the vehicle.
  12. Remove the blocks from the wheels.