GM Service Manual Online
For 1990-2009 cars only

Downstop Adjustment Procedure

  1. Turn pump bypass valve to open position (full clockwise).
  2. Lower folding top by hand.
  3. Lay straightedge level across rear edge of side rail garnish moldings with straightedge level extending to left and right edges of vehicle.
  4. Reposition plastic splash shield to allow access to downstop bolts/screws.

  5. Object Number: 386056  Size: MH
  6. Loosen downstop bolts/screws.
  7. 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.

  8. Adjust octagonal downstop cams so that folding top is level from left to right along straightedge level and allows sufficient clearance for boot cover to be installed
  9. Tighten
    Tighten the downstop bolts/screws to 17 N·m (13 lb ft).

  10. Remove straightedge level.
  11. Turn pump bypass valve to closed position (full counter-clockwise).
  12. Perform upstop adjustment if necessary as outlined in the procedure below, otherwise raise top (automatically).

Upstop Adjustment Procedure

  1. Turn pump bypass valve to open position (full clockwise).
  2. Lower folding top by hand.

  3. Object Number: 386056  Size: MH
  4. Turn upstops all the way in (clockwise).
  5. Raise (manually) and latch folding top.
  6. With top latched, turn each upstop counter-clockwise (out) until they contact pivot bracket.
  7. Lower folding top (manually).
  8. 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.

  9. Turn upstops out of outer arm an additional 1/4 of a turn.
  10. Tighten
    Tighten the jam nut on upstops to 17 N·m (13 lb ft).

  11. Turn pump bypass valve to closed position (full counterclockwise).
  12. Raise and latch convertible top.