Info - Availability of Pickup Box Reinforcement Kits for Toolbox/Rear Window Barrier/Ladder Rack Applications

This bulletin is being revised to add 2004-2005 1500 Series Crew Cab with 5'8" Pickup Box model and change equipment weight capacity information. Please discard Corporate Bulletin Number 01-08-66-005B (Section 08 -- Body and Accessories).

Built Prior to the following VIN Breakpoints:

Pickup box reinforcement kits are available as an accessory for customers who may want to install a cross toolbox, side box, or a ladder rack system.

Important: The reinforcements must be installed before adding a toolbox or ladder rack system. After the reinforcements have been installed, follow the instructions supplied with the toolbox/ladder rack system for installation onto the pickup box.

Pickup Box Reinforcement Installation

Use the following service procedure and the applicable kit part number listed below to install the reinforcements.

Cross Toolbox and Rear Window Barrier Applications - Front Reinforcement Installation

Important: The horizontal surfaces of the reinforcements must be flush to the horizontal surface of the pickup box top rail. Use a clamping tool when positioning the reinforcements onto the top rail to ensure flushness to the outer panel.

1. Place the front L-shaped reinforcements into position on the front top of the pickup box. For vehicles equipped with an over the rail bedliner, the bedliner should be removed with the aid of an assistant prior to installing these reinforcements.
2. Mark the holes necessary for drilling.
3. Remove the front reinforcements.

Important: Use a block of wood and/or a drill stop in order to protect the back of the cab while drilling.

4. Drill two 13.5 mm (0.54 in) holes per side into the box section of the front panel.
5. Drill 7.5 mm (0.30 in) holes into the weld flange of the side outer panel.
6. Apply anti-corrosion material to the drilled holes as necessary per the GM 4901M-D-2005 (English) or 4901M-D-F2005 (French) Approved Refinish Materials booklet. The information for the 2005 GM Approved Refinish Materials booklet will now be online at the GMGOODWRENCH WEB SITE ONLY. Printed books have been discontinued. Steps to the site are as follows:

6.1.	Go to www.gmgoodwrench.com.

6.2.	Click on GM Collision Parts.

6.3.	Click on GM Technical Repair Information.

6.4.	Click on Paint Shop.

7. Place the front reinforcements back onto the box, lining up the drilled holes.
8. Install the large shoulder (M8) bolts into the reinforcement and front panel (total of 4) and the small (M6) bolts into the reinforcement and side outer panel (total of 6) with the nuts.

Tighten

•	Tighten the M8 bolts to 25 N·m (18 lb ft).

•	Tighten the M6 bolts to 9 N·m (79 lb in).

9. Remove all metal shavings from the pickup box after installation.
10. Install the bedliner if equipped with the aid of an assistant. The bedliner may need to be trimmed in order to obtain the necessary clearance for the reinforcements.

Ladder Rack and/or Side ToolBox Applications - Reinforcement Kit Installation

1. Install the LH and RH front L-shaped reinforcements using the procedure above.
2. Remove the LH and RH rear taillamp assemblies. This is necessary to gain access to install the rearmost bolt of the rear reinforcement.



3. Place the LH and RH rear reinforcements into position on the pickup box.
4. Mark the holes necessary for drilling and remove the reinforcements.
5. Drill 7.5 mm (0.30 in) holes into the weld flange of the side outer panel.
6. Apply anti-corrosion material to the drilled holes as necessary. Refer to step 6 under Front Reinforcement Installation procedure.
7. Place the rear reinforcements back onto the pickup box.
8. Install the M6 bolts through the reinforcement and side panel with the nuts.

Tighten
Tighten the bolts to 9 N·m (79 lb in).

9. Install the LH and RH rear taillamp assemblies.



10. Place the LH and RH center reinforcement into position on the pickup box.

•	On the 2.4 m (8 ft) long pickup box models, this center reinforcement fits over the existing center stake hole.

•	On the 1.7 m (5 ft, 8 in) and 2 m (6.5 ft) short box models, these center reinforcements are recommended to be installed. The reinforcements should be centered between the front and rear reinforcements on the pickup box.

11. Mark the holes necessary for drilling and remove the brackets.
12. Drill 7.5 mm (0.30 in) holes into the weld flange of the side outer panel.
13. Touch-up the drilled holes as necessary. Refer to step 6 under the Front Reinforcement Installation procedure.
14. Place the center reinforcements back onto the pickup box.
15. Install the M6 bolts through the reinforcement and side panel with the nuts.

Tighten
Tighten the bolts to 9 N·m (79 lb in).

16. Remove any metal shavings from the pickup box after installation.

*Maximum Equipment Weight Capacities (Equipment and Cargo)

*The combined weight for all rail-mounted equipment should not exceed 454 kg (1, 000 lb). Excluded is the 1500 Series Crew Cab models with 5’8" pickup box length. A reinforcement kit for rail-mounted add-on equipment is recommended as described in this bulletin.

Ladder racks are not recommended for 1500 Series Crew Cab models with 5’8" pickup box. Maximum recommended cross-mounted tool box and cargo weight is 136 kg (300 lb) for the 1500 Series Crew Cab with 5’8" pickup box.

Parts are currently available from GMSPO.