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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28624" data-attributes="member: 9417"> <table style='width: 100%'><tr><td>Caution: Incorrect wheel nuts or improperly tightened wheel nuts can cause the wheel to become loose and even come off. This could lead to an accident. Be sure to use the correct wheel nuts. <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss8-1864476" target="_blank">[H3]Wheel Nut Caps[/H3]</a> Install the wheel nut caps after tightening the wheel nuts. Install the wheel nut caps finger tight, plus 1/2 turn. <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss9-1864476" target="_blank">[H3]Jounce Bumper[/H3]</a> Important: This modification is required on all 2WD vehicles EXCEPT the following: Excludes: <table style='width: 100%'><tr><td>   • </td><td>2006-2007 2WD Extended Cab -- Short Box (model C15553)</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>2006-2007 2WD Crew Cab -- Short Box with Enhanced Trailering (RPO NHT) (model C15543)</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>2006-2007 2WD Extended Cab -- Standard Box with Enhanced Trailering (RPO NHT) (model C15753)</td></tr></table> It will be required to replace the existing front suspension spring/jounce bumper with Jounce Bumper kit, P/N 12499481. The following procedure should be followed: <ol> <li data-xf-list-type="ol">Raise and support the vehicle.</li> <li data-xf-list-type="ol">Remove the nut from the spring bumper stud.</li> <li data-xf-list-type="ol">Remove the spring bumper.</li> <li data-xf-list-type="ol"><img src="https://gm.saturn.team/images/348561.gif" alt="Object Number: 348561 Size: SH" class="fr-fic fr-dii fr-draggable " style="" /></li> <li data-xf-list-type="ol">Install a new spring bumper assembly for 2WD 1500 Series Only with 20" wheels.</li> <li data-xf-list-type="ol">Reuse the nut from the original bumper. Install the nut to the spring bumper stud.</li> <li data-xf-list-type="ol">Tighten Tighten the nut to 30 N·m (22 lb ft).</li> <li data-xf-list-type="ol">Remove the safety stands.</li> <li data-xf-list-type="ol">Lower the vehicle.</li> </ol> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss10-1864476" target="_blank">[H3]Knee Bolster Deflector[/H3]</a> Important: This modification is required for the following vehicles and ONLY applies to Extended Cab Long Box (K15953) Pickup models: 1999-2005 Chevrolet Silverado and GMC Sierra (1500 Series Only): <table style='width: 100%'><tr><td>   • </td><td>2005 Vehicles Built in Pontiac (VIN Code E) prior to VIN Breakpoint 5E100134</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>2005 Vehicles Built in Oshawa (VIN Code 1) prior to VIN Breakpoint 51113131</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>2005 Vehicles Built in Ft. Wayne (VIN Code Z) prior to VIN Breakpoint 5Z126605</td></tr></table> The following procedure should be followed: <ol> <li data-xf-list-type="ol">Apply the parking brake to prevent the vehicle from moving.</li> <li data-xf-list-type="ol">Remove the fuse panel cover.</li> <li data-xf-list-type="ol">Remove the I/P cluster trim plate bezel.</li> <li data-xf-list-type="ol">Remove the knee bolster.</li> <li data-xf-list-type="ol">Remove the 2 mm (0.078 in) thick knee bolster deflector.</li> <li data-xf-list-type="ol">Install the 1.5 mm (0.059 in) thick knee bolster deflector, P/N 12499966.</li> </ol> A detailed instruction sheet will be provided with the service part. <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss11-1864476" target="_blank">[H3]Re-Programming[/H3]</a> It will be necessary to reprogram the PCM for speedometer accuracy. Contact Techline (1-800-828-6860 English or 1-800-503-3222 French) to obtain a VCI number. Then refer to the table below for the appropriate calibration part number based on the model year and axle ratio. [H4]Calibration Information Documentation[/H4] <ol> <li data-xf-list-type="ol">Make a copy of the "Accessory Wheel and Tire Information Form" included in this bulletin.</li> <li data-xf-list-type="ol">Provide all information required on the form.</li> <li data-xf-list-type="ol">Make a copy of the completed form for the customer to keep in the vehicle along with their Owner's Manual.</li> <li data-xf-list-type="ol">File the original completed form in the Dealership's Vehicle Service History folder.</li> </ol> Important: Because this is not a warranty repair, dealers will incur a charge to obtain a VCI number. Important: A VCI number will only be available for the following models: <table style='width: 100%'><tr><td>   • </td><td>1999-2007 Chevrolet Silverado and GMC Sierra (1500 Series Only)</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>EXCLUDES 1999-2000 vehicles equipped with 4.3L engine (RPO L35)</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>EXCLUDES vehicles equipped with Quadrasteer (RPO NYS)</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>EXCLUDES Parallel Hybrid Truck (RPO HP2)</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>EXCLUDES 2001-2004 vehicles equipped with Traction Control (RPO NW7) combined with 3.42 Axle Ratio (RPO GU6)</td></tr></table> Refer to the Model Application Chart to in the beginning of this bulletin to verify usage. Important: <table style='width: 100%'><tr><td>   • </td><td>Calibrations are not available for 1999 and 2000 model year vehicles with 3.08 axle.</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>Calibrations are not available for 1999 and 2000 model year vehicles equipped with 4.3L engine (RPO L35).</td></tr></table> <table style='width: 100%'><tr><th>MY 1999 Pickups Only </th><th>MY 2000 Pickups Only </th><th>MY 2001-2002 Pickups Only </th><th>MY 2003 Pickups Only </th><th>MY 2004 Pickups Only </th><th>MY 2005 Pickups Only </th><th>MY 2006 Pickups Only </th><th>MY 2007 Pickups Only </th></tr><tr><td> </td><td> </td><td>12589876 -- GU4 (3.08) </td><td>12589880 -- GU4 (3.08) </td><td>12589884 -- GU4 (3.08) </td><td>12593917 -- GU5 (3.23) </td><td>12601282 -- GU5 (3.23) </td><td>12601286 -- GU5 (3.23) </td></tr><tr><td>12589869 -- GU6 (3.42) </td><td>12589873 -- GU6 (3.42) </td><td>12589877 -- GU6 (3.42) </td><td>12589881 -- GU6 (3.42) </td><td>12589885 -- GU6 (3.42) </td><td>12593918 -- GU6 (3.42) </td><td>12601283 -- GU6 (3.42) </td><td>12601287 -- GU6 (3.42) </td></tr><tr><td>12589870 -- GT4 (3.73) </td><td>12589874 -- GT4 (3.73) </td><td>12589878 -- GT4 (3.73) </td><td>12589882 -- GT4 (3.73) </td><td>12589886 -- GT4 (3.73) </td><td>12593919 -- GT4 (3.73) </td><td>12601284 -- GT4 (3.73) </td><td>12601288 -- GT4 (3.73) </td></tr><tr><td>12589871 -- GT5 (4.10) </td><td>12589875 -- GT5 (4.10) </td><td>12589879 -- GT5 (4.10) </td><td>12589883 -- GT5 (4.10) </td><td>12589887 -- GT5 (4.10) </td><td>12593920 -- GT5 (4.10) </td><td>12601285 -- GT5 (4.10) </td><td>12601289 -- GT5 (4.10) </td></tr></table>There is a tire size value in the ABS module that must also be updated using the Tech 2. Use the following path to update the ABS module: Diagnostics>Model Year>Vehicle Type>Chassis>Product Line>GVW>ABS>Special Functions>Tire Size Calibration>Verify VIN>Select New Tire Size. Important: If original equipment tires/wheels are reinstalled, it will be necessary to reset the programming of the PCM and the ABS module to the original specifications. <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss12-1864476" target="_blank">[H3]Labels[/H3]</a> After installing the recommended P275/55R20 tires, place the provided label on the vehicle. The label should be located on the door jamb, near the original tire label, and should not cover up the original tire label. Be sure that the surface is clean and dry. The surface temperature should not be less than 21°C (70°F). The label is provided as a guide for tire inflation pressures and information relevant to occupant/cargo capacities. </td></tr></table></blockquote>