GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 2WD 🢒 Engine 🢒 Engine Electrical 🢒 Assist Step Front Extension Replacement

Removal Procedure

    Object Number: 350657 Size: SH
  1. Remove the screws from the front edge of the assist step. Open the door to expose the inner screw.

    2. Object Number: 350737 Size: SH
  2. Remove the push clips from the front edge of the assist step.
  3. Raise the vehicle to a suitable height.
  4. Remove the nut from the front lower corner of the assist step.

    5. Object Number: 350651 Size: SH
  5. Remove the assist step pad nuts.
  6. Remove the assist step pad.
    7. 6.1. Insert a plastic tool along the edge.
    6.2. Pull upward on the assist step pad until it fully releases from the assist step plate.

    Object Number: 350668 Size: SH
  7. Remove the front section of the assist step as follows:
    8. 7.1. Lift in the center of the assist step.
    7.2. Slide the front section forward.
    7.3. Lift upward on the assist step to release from the retainer.

    Object Number: 350685 Size: SH
  8. Remove the nut and bolt (1) from the front assist step support bracket to the pinchweld flange.
  9. Remove the assist step support bracket bolts (2) from the underbody.
  10. Remove the assist step support bracket.

Installation Procedure

    Object Number: 350685 Size: SH
  1. Install the assist step support bracket.

    2. 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. Install the assist step support bracket bolts (2) to the underbody .

    3. Tighten
    Tighten the assist step support bracket bolts (2) to the underbody to 25 N·m (18 lb ft).

  3. Install the nut and bolt (1) to the assist step support bracket and to the pinchweld flange.

    4. Tighten
    Tighten the nut and bolt (1) to the assist step support bracket and to the pinchweld flange to 10 N·m (89 lb in).


    Object Number: 350668 Size: SH
  4. Use the following procedure when installing the assist step:
    5. 4.1. Check the fit to the step well and the door opening.
    4.2. Check the height and the alignment to rocker panel.
    4.3. Check the alignment to the cladding and to the body.
    4.4. Check the gaps between the wheel well moldings.
    4.5. Check the lower edge of the assist step to ensure a even gap along the door edge and the body.
    4.6. Install the front section of the assist step to fit over the rear section.

    Align both sections before installing the nuts to the assist step pad.

  5. Install the assist step pad to assist step.

    6. Align the assist step pad to the assist step and press downward until fully seated.

  6. Install the nuts to the assist step pad by hand.

    7. Tighten
    Tighten the nuts to the assist step pad to 2 N·m (18 lb in).

  7. Install the nut to the front lower corner of the assist step.

    8. Tighten
    Tighten the nut to the front lower corner of the assist step to 10 N·m (89 lb in).

  8. Lower the vehicle to a suitable height.

    9. Object Number: 350737 Size: SH
  9. Install the push clips to the front edge of the assist step.

    10. Object Number: 350657 Size: SH
  10. Install the screws to the front edge of the assist step. Open the door to expose the inner screw.

    11. Tighten
    Tighten the screws to the upper and inner edges of the assist step to 2 N·m (18 lb in).

  11. Lower the vehicle.