Copy of TSB:03-03-10-006C

gmcgrands · July 11, 2005

I picked up my new truck (05 Sierra Denali) from my dealer on 7/7/05 with the dealer installed factory 20" wheels. I had requested in advance they reflash the PCM and set the tire size for the ABS and or VSES. I also requested them to check on the tire presure monitoring as was recommended on this site.

I also checked to be sure the Vin # was beyond those allowing the 20" wheels.

The service man and sales people tell me the TSB is not required for crew cabs? I think I am getting the run around.

1) How can I get a copy of the TSB for all the details?

2) How can I tell if and when they do anything or if its been done?

3)Can I request a service report with the VCI number?

4)Any way to tell if the ABS or VSES has been done.

5)How can I tell if the Vehicle was orginally equipped with tire presure monitoring?

I love the truck and it seems to drive well, just wonder if Im missing anything or it may be better after the above items are done. Help!

GM-Tech · July 11, 2005

1) See Below

2) That's not easy. You'd have to first get the calibration ID's out of the PCM and then see if they've changed when they get done. Unless you have a scanner capable of this, you'll have to take their word for it.

3) They're supposed to give you a sheet that has the original tire size and VCI number along with the new tire size and VCI number. That form is at the end of the TSB included here. We put that in every vehicle we put 20's on.

4) ABS/VSES is a little easier, but you still need a scanner. There's an option in our scanner to view the currently configured tire size. Obviously is should be a 20" tire.

5) Pickup trucks do not have this option... unless something changed in the 2005 model.

I don't believe this bulletin takes into account the changes that were made after a certain breakpoint, allowing 20's on crew cabs if they're after that. This bulletin says "excludes all crew cabs" but that's no longer the case. I posted the bulletin with the breakpoints in this forum somewhere.

--------------------

Info - 20 Inch Wheels and Tires Available Through GMSPO #03-03-10-006C - (Jan 5, 2005)

Table 1: 20" Wheels

20" Wheels and Tires Available Through GMSPO

1999-2005 Chevrolet Silverado 1500 Series Only

1999-2005 GMC Sierra 1500 Series Only

Excludes all Crew Cab Vehicles

Excludes 1999-2000 Vehicles with 4.3L Engine (VIN W -- RPO L35)

Excludes Vehicles with Quadrasteer (RPO NYS)

Excludes Parallel Hybrid Truck (RPO HP2)

Excludes Vehicles with Traction Control combined with 3.42 Axle Ratio (RPO NW7)

Refer to the Model Application Chart in the beginning of this bulletin to verify usage.

This bulletin is being revised to provide Calibration Documentation information and VIN breakpoint information for the required modifications. Please discard Corporate Bulletin Number 03-03-10-006B (Section 03 -- Suspension).

Model Application Chart:

Cab

Box

2WD*

4WD

Regular

Standard

1.8 m (6 ft)

Y

N/A

Regular

Long

2.4 m (8 ft)

Y

N/A

Extended

Standard

1.8 m (6 ft)

Y

Extended

Long

2.4 m (8 ft)

Y

*Excludes vehicles with Traction Control combined with 3.42 Axle Ratio (RPO NW7).

Excludes 1999-2000 vehicles with 4.3L (VIN W -- RPO L35) engine.

The purpose of this bulletin is to provide a reference guide for the technician to upgrade a vehicle from factory wheels and tires to 20" wheels and tires, which are available through GMSPO (dealers must confirm availability of parts prior to utilizing this bulletin). This guide will cover Tire Specifications, the Spare Tire, Balancing, Center Cap Installation, Wheel Nuts, Re-Programming and Label requirements.

Tires

GM has designed 20" wheels based on the Goodyear Eagle LS P275/55R20 tire. The Goodyear Eagle LS tire has a Tire Performance Criteria spec #1235. This tire has been designed to GM's specific Tire Performance Criteria. GM's Tire Performance Criteria specifications meet or exceed all Federal safety guidelines.

Spare Tire

A P265/75R16 or P265/70R17 tire should be used as a spare. Re-use the vehicle's original spare wheel to mount the spare tire. The spare tire should be used to drive the vehicle to a tire repair/replacement facility and is not intended for extended driving conditions.

Tire Changers

Dealers must have the correct level of tire changing equipment to perform tire changing services. GM requirements and recommendations for servicing glamour wheels are as follows:

• Rim Clamp design

• Runflat capable (preferred)

• Side mounted bead breaking to reduce stress on the wheel and tire

• No metal contact to the wheel at the clamping jaws

• Protective devices to prevent damage during mounting and dismounting operations

• Regulated air pressure to protect user and wheel assembly

• Approved lubricant to avoid wheel slip and damage to the wheel

For further information regarding equipment meeting the requirements for this program, call 1-800-GM-TOOLS.

Balancing

MC style coated weights are recommended and will provide the best balancing of the tire-wheel assembly. If stick-on weights are used, be sure to follow the manufacturers' recommended installation procedure (SI Document ID #664222) making sure the surface is clean and dry. Using the incorrect type of weights will result in improper fit, and such weights may fall off the wheel.

Balancing of the tire and wheel assembly must be performed on a computerized balancer, capable of static and dynamic wheel balance modes. Assemblies should be balanced to within 1/4 ounce on either rim flange. Proper cones and adapters should be used, free of nicks and burrs to ensure proper balancing.

Center Cap

Install the center cap onto the wheel after the tire has been mounted and balanced, but BEFORE the assembly is installed onto the vehicle. The preferred method for center cap installation is to push in by hand. As an alternate, use a nonmetallic object to push the center cap into place. Attempting to "hammer-on" the caps may result in damage to the cap.

Wheel (Lug) Nuts

ALUMINUM WHEELS REQUIRE SPECIAL WHEEL NUTS. Each wheel nut should be torqued in the appropriate torque sequence (refer to graphic) and to 190 N·m (140 lb ft). The torque should be re-checked after the first 160 km (100 mi). To help protect the wheels from theft, a wheel lock kit is also available.

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.

Wheel Nut Caps

Install the wheel nut caps after tightening the wheel nuts. Install the wheel nut caps finger tight, plus 1/2 turn.

Jounce Bumper

For 2WD vehicles, 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:

Raise and support the vehicle.

Remove the nut from the spring bumper stud.

Remove the spring bumper.

Install a new spring bumper assembly for 2WD 1500 Series Only with 20" wheels.

Reuse the nut from the original bumper. Install the nut to the spring bumper stud.

Tighten

Tighten the nut to 30 N·m (22 lb ft).

Remove the safety stands.

Lower the vehicle.

Knee Bolster Deflector

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):

• 2005 Vehicles Built in Pontiac (VIN Code E) prior to VIN Breakpoint 5E100134

• 2005 Vehicles Built in Oshawa (VIN Code 1) prior to VIN Breakpoint 51113131

• 2005 Vehicles Built in Ft. Wayne (VIN Code Z) prior to VIN Breakpoint 5Z126605

The following procedure should be followed:

Apply the parking brake to prevent the vehicle from moving.

Remove the fuse panel cover.

Remove the I/P cluster trim plate bezel.

Remove the knee bolster.

Remove the 2 mm (0.078 in) thick knee bolster deflector.

Install the 1.5 mm (0.059 in) thick knee bolster deflector, P/N 12499966.

A detailed instruction sheet will be provided with the service part.

Re-Programming

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.

Calibration Information Documentation

Make a copy of the "Accessory Wheel and Tire Information Form" included in this bulletin.

Provide all information required on the form.

Make a copy of the completed form for the customer to keep in the vehicle along with their Owner's Manual.

File the original completed form in the Dealership's Vehicle Service History folder.

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:

• 1999-2005 Chevrolet Silverado and GMC Sierra (1500 Series Only)

• EXCLUDES all Crew Cab vehicles

• EXCLUDES 1999-2000 vehicles equipped with 4.3L engine (RPO L35)

• EXCLUDES vehicles equipped with Quadrasteer (RPO NYS)

• EXCLUDES Parallel Hybrid Truck (RPO HP2)

• EXCLUDES vehicles equipped with Traction Control combined with 3.42 Axle Ratio (RPO NW7)

Refer to the Model Application Chart to in the beginning of this bulletin to verify usage.

Important:

• Calibrations are not available for 1999 and 2000 model year vehicles with 3.08 axle.

• Calibrations are not available for 1999 and 2000 model year vehicles equipped with 4.3L engine (RPO L35).

MY 1999 Pickups Only

MY 2000 Pickups Only

MY 2001-2002 Pickups Only

MY 2003 Pickups Only

MY 2004 Pickups Only

MY 2005 Pickups Only

12589876 -- GU4 (3.08)

12589880 -- GU4 (3.08)

12589884 -- GU4 (3.08)

12593917 -- GU5 (3.23)

12589869 -- GU6 (3.42)

12589873 -- GU6 (3.42)

12589877 -- GU6 (3.42)

12589881 -- GU6 (3.42)

12589885 -- GU6 (3.42)

12593918 -- GU6 (3.42)

12589870 -- GT4 (3.73)

12589874 -- GT4 (3.73)

12589878 -- GT4 (3.73)

12589882 -- GT4 (3.73)

12589886 -- GT4 (3.73)

12593919 -- GT4 (3.73)

12589871 -- GT5 (4.10)

12589875 -- GT5 (4.10)

12589879 -- GT5 (4.10)

12589883 -- GT5 (4.10)

12589887 -- GT5 (4.10)

12593920 -- GT5 (4.10)

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.

Labels

After installing the recommended P275/55R20 tires, place the provided label on the vehicle. The label should be located on the door jam, 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 (65°F). The label is provided as a guide for tire inflation pressures and information relevant to occupant/cargo capacities.

Parts Information

20" Wheels Style #

Single Sets

Multi-Packs

Wheel Name

Part No.

Pcs/Pack

Part No.

Pcs/Pack

CK793

88962793

1

12499371

4

CK795

88962795

1

12499372

4

CK797

88962797

1

12499373

4

CK799

88962799

1

12499374

4

CK801

88962801

1

12499375

4

CK803

88962803

1

12499376

4

CK805

88962805

1

12499377

4

CK807

88962807

1

12499378

4

CK809

88962809

1

12499379

4

Part Description

Part Number

Qty

Tires -- Fullsize Truck

P275/55R20 Good Year Eagle LS

09595312

(in Canada, 89033896 or LU069493)

4

Valve Stem Cap

09591607

4

Center Cap

Brushed -- Chevrolet

15766002

4

Brushed -- GMC

88961684

4

Polished -- Chevrolet

88963139

4

Polished -- GMC

88963140

4

Chrome -- Chevrolet

88963143

4

Chrome -- GMC

88963144

4

Lug Nuts

09591772

24

Wheel Lock Kit

12497479

1

Lug Nut Cap

Black

15646250

24

Chrome

15045768

24

Stainless

88963146

24

Jounce Bumper Kit

12499481

1

Knee Bolster Bracket

12499966

1

Parts are currently available from GMSPO.

Warranty Information

Wheels

All GM Accessories sold and permanently installed on a GM vehicle PRIOR to new vehicle delivery will be covered under the provisions of the New Vehicle Limited Warranty.

In the event GM Accessories are installed AFTER new vehicle delivery, or are replaced under the new vehicle warranty, they will be covered (parts and labor) for the balance of the vehicle warranty, but in no event less than 12 months/12,000 miles (in Canada, 12 months/20,000 kilometers). This coverage is only effective for GM Accessories permanently installed by a GM dealer or a GM approved ADI (Accessory Distributor / Installer).

GM Accessories sold over-the-counter, or those not requiring installation, will continue to receive the standard GM Dealer Parts Warranty of 12 months from the date of purchase (parts only).

Tires

Any approved tire installed on a GM Vehicle PRIOR to delivery will be covered under the provisions of the New Vehicle Limited Warranty. Tires are covered against defects in material and workmanship. Tires are warranted for defects "without" prorated charge for tread mileage. Subsequent replacements under this warranty will continue to be covered for the remainder of the New Vehicle Limited Warranty.

Any approved tire installed on a GM Vehicle PRIOR to delivery may continue to be warranted on a prorated basis by the tire manufacturer once the New Vehicle Limited Warranty expires.

Any approved tire installed AFTER delivery will be covered under the provisions of the tire manufacturer warranty.

USA dealers should refer to GM Warranty Administration Bulletin 00-03-10-003E and GM Parts Process / Policy Bulletin IB03-001 for more information.

Canadian dealers should refer to GM Warranty Administration Bulletin 01-03-10-003A.

GM Warranty Claims Processing

Only GM dealerships have the ability to file warranty claims for GM Parts and Accessories. Therefore, any warranty claims filed against such parts must be handled by the servicing GM dealership. This includes those parts purchased from a GM-approved ADI (Accessory Distributor / Installer).

ACCESSORY WHEEL AND TIRE INFORMATION FORM

You have just modified your vehicle by installing an "Accessory Package" which includes Wheels and Tires. This form contains important information about your accessory installation. In an effort to provide superior service to you, our customer, we ask that you please present this form to your Servicing Dealer when removing or installing wheels and tires on your vehicle. This form contains important information necessary to service your vehicle.

VIN: ______________________________________________________________

Original Equipment:

VCI #: _____________________________________________

Tire & Wheel Size: ___________________________________

Accessory Equipment:

VCI #: _____________________________________________

Tire and Wheel Size: _________________________________

Important: Please store this form in the vehicle with your Owner's Manual. A record of this form will also be kept on file at your Servicing Dealer.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

gmcgrands · July 14, 2005

Thanks you are most helpfull. I can see were the dealer may only see were crew cabs are excluded, if They were not aware of the other TSB. Do dealers not keep up on these tsb's ? I guess I will have to go back and try to get them up to speed and have the truck back in.

1) See Below
2) That's not easy. You'd have to first get the calibration ID's out of the PCM and then see if they've changed when they get done. Unless you have a scanner capable of this, you'll have to take their word for it.

3) They're supposed to give you a sheet that has the original tire size and VCI number along with the new tire size and VCI number. That form is at the end of the TSB included here. We put that in every vehicle we put 20's on.

4) ABS/VSES is a little easier, but you still need a scanner. There's an option in our scanner to view the currently configured tire size. Obviously is should be a 20" tire.

5) Pickup trucks do not have this option... unless something changed in the 2005 model.

I don't believe this bulletin takes into account the changes that were made after a certain breakpoint, allowing 20's on crew cabs if they're after that. This bulletin says "excludes all crew cabs" but that's no longer the case. I posted the bulletin with the breakpoints in this forum somewhere.

--------------------

Info - 20 Inch Wheels and Tires Available Through GMSPO #03-03-10-006C - (Jan 5, 2005)

Table 1: 20" Wheels

20" Wheels and Tires Available Through GMSPO

1999-2005 Chevrolet Silverado 1500 Series Only

1999-2005 GMC Sierra 1500 Series Only

Excludes all Crew Cab Vehicles

Excludes 1999-2000 Vehicles with 4.3L Engine (VIN W -- RPO L35)

Excludes Vehicles with Quadrasteer (RPO NYS)

Excludes Parallel Hybrid Truck (RPO HP2)

Excludes Vehicles with Traction Control combined with 3.42 Axle Ratio (RPO NW7)

Refer to the Model Application Chart in the beginning of this bulletin to verify usage.

This bulletin is being revised to provide Calibration Documentation information and VIN breakpoint information for the required modifications. Please discard Corporate Bulletin Number 03-03-10-006B (Section 03 -- Suspension).

Model Application Chart:

Cab

Box

2WD*

4WD

Regular

Standard

1.8 m (6 ft)

Y

N/A

Regular

Long

2.4 m (8 ft)

Y

N/A

Extended

Standard

1.8 m (6 ft)

Y

Y

Extended

Long

2.4 m (8 ft)

Y

Y

*Excludes vehicles with Traction Control combined with 3.42 Axle Ratio (RPO NW7).

Excludes 1999-2000 vehicles with 4.3L (VIN W -- RPO L35) engine.

The purpose of this bulletin is to provide a reference guide for the technician to upgrade a vehicle from factory wheels and tires to 20" wheels and tires, which are available through GMSPO (dealers must confirm availability of parts prior to utilizing this bulletin). This guide will cover Tire Specifications, the Spare Tire, Balancing, Center Cap Installation, Wheel Nuts, Re-Programming and Label requirements.

Tires

GM has designed 20" wheels based on the Goodyear Eagle LS P275/55R20 tire. The Goodyear Eagle LS tire has a Tire Performance Criteria spec #1235. This tire has been designed to GM's specific Tire Performance Criteria. GM's Tire Performance Criteria specifications meet or exceed all Federal safety guidelines.

Spare Tire

A P265/75R16 or P265/70R17 tire should be used as a spare. Re-use the vehicle's original spare wheel to mount the spare tire. The spare tire should be used to drive the vehicle to a tire repair/replacement facility and is not intended for extended driving conditions.

Tire Changers

Dealers must have the correct level of tire changing equipment to perform tire changing services. GM requirements and recommendations for servicing glamour wheels are as follows:

• Rim Clamp design

• Runflat capable (preferred)

• Side mounted bead breaking to reduce stress on the wheel and tire

• No metal contact to the wheel at the clamping jaws

• Protective devices to prevent damage during mounting and dismounting operations

• Regulated air pressure to protect user and wheel assembly

• Approved lubricant to avoid wheel slip and damage to the wheel

For further information regarding equipment meeting the requirements for this program, call 1-800-GM-TOOLS.

Balancing

MC style coated weights are recommended and will provide the best balancing of the tire-wheel assembly. If stick-on weights are used, be sure to follow the manufacturers' recommended installation procedure (SI Document ID #664222) making sure the surface is clean and dry. Using the incorrect type of weights will result in improper fit, and such weights may fall off the wheel.

Balancing of the tire and wheel assembly must be performed on a computerized balancer, capable of static and dynamic wheel balance modes. Assemblies should be balanced to within 1/4 ounce on either rim flange. Proper cones and adapters should be used, free of nicks and burrs to ensure proper balancing.

Center Cap

Install the center cap onto the wheel after the tire has been mounted and balanced, but BEFORE the assembly is installed onto the vehicle. The preferred method for center cap installation is to push in by hand. As an alternate, use a nonmetallic object to push the center cap into place. Attempting to "hammer-on" the caps may result in damage to the cap.

Wheel (Lug) Nuts

ALUMINUM WHEELS REQUIRE SPECIAL WHEEL NUTS. Each wheel nut should be torqued in the appropriate torque sequence (refer to graphic) and to 190 N·m (140 lb ft). The torque should be re-checked after the first 160 km (100 mi). To help protect the wheels from theft, a wheel lock kit is also available.

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.

Wheel Nut Caps

Install the wheel nut caps after tightening the wheel nuts. Install the wheel nut caps finger tight, plus 1/2 turn.

Jounce Bumper

For 2WD vehicles, 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:

Raise and support the vehicle.

Remove the nut from the spring bumper stud.

Remove the spring bumper.

Install a new spring bumper assembly for 2WD 1500 Series Only with 20" wheels.

Reuse the nut from the original bumper. Install the nut to the spring bumper stud.

Tighten

Tighten the nut to 30 N·m (22 lb ft).

Remove the safety stands.

Lower the vehicle.

Knee Bolster Deflector

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):

• 2005 Vehicles Built in Pontiac (VIN Code E) prior to VIN Breakpoint 5E100134

• 2005 Vehicles Built in Oshawa (VIN Code 1) prior to VIN Breakpoint 51113131

• 2005 Vehicles Built in Ft. Wayne (VIN Code Z) prior to VIN Breakpoint 5Z126605

The following procedure should be followed:

Apply the parking brake to prevent the vehicle from moving.

Remove the fuse panel cover.

Remove the I/P cluster trim plate bezel.

Remove the knee bolster.

Remove the 2 mm (0.078 in) thick knee bolster deflector.

Install the 1.5 mm (0.059 in) thick knee bolster deflector, P/N 12499966.

A detailed instruction sheet will be provided with the service part.

Re-Programming

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.

Calibration Information Documentation

Make a copy of the "Accessory Wheel and Tire Information Form" included in this bulletin.

Provide all information required on the form.

Make a copy of the completed form for the customer to keep in the vehicle along with their Owner's Manual.

File the original completed form in the Dealership's Vehicle Service History folder.

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:

• 1999-2005 Chevrolet Silverado and GMC Sierra (1500 Series Only)

• EXCLUDES all Crew Cab vehicles

• EXCLUDES 1999-2000 vehicles equipped with 4.3L engine (RPO L35)

• EXCLUDES vehicles equipped with Quadrasteer (RPO NYS)

• EXCLUDES Parallel Hybrid Truck (RPO HP2)

• EXCLUDES vehicles equipped with Traction Control combined with 3.42 Axle Ratio (RPO NW7)

Refer to the Model Application Chart to in the beginning of this bulletin to verify usage.

Important:

• Calibrations are not available for 1999 and 2000 model year vehicles with 3.08 axle.

• Calibrations are not available for 1999 and 2000 model year vehicles equipped with 4.3L engine (RPO L35).

MY 1999 Pickups Only

MY 2000 Pickups Only

MY 2001-2002 Pickups Only

MY 2003 Pickups Only

MY 2004 Pickups Only

MY 2005 Pickups Only

12589876 -- GU4 (3.08)

12589880 -- GU4 (3.08)

12589884 -- GU4 (3.08)

12593917 -- GU5 (3.23)

12589869 -- GU6 (3.42)

12589873 -- GU6 (3.42)

12589877 -- GU6 (3.42)

12589881 -- GU6 (3.42)

12589885 -- GU6 (3.42)

12593918 -- GU6 (3.42)

12589870 -- GT4 (3.73)

12589874 -- GT4 (3.73)

12589878 -- GT4 (3.73)

12589882 -- GT4 (3.73)

12589886 -- GT4 (3.73)

12593919 -- GT4 (3.73)

12589871 -- GT5 (4.10)

12589875 -- GT5 (4.10)

12589879 -- GT5 (4.10)

12589883 -- GT5 (4.10)

12589887 -- GT5 (4.10)

12593920 -- GT5 (4.10)

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.

Labels

After installing the recommended P275/55R20 tires, place the provided label on the vehicle. The label should be located on the door jam, 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 (65°F). The label is provided as a guide for tire inflation pressures and information relevant to occupant/cargo capacities.

Parts Information

20" Wheels Style #

Single Sets

Multi-Packs

Wheel Name

Part No.

Pcs/Pack

Part No.

Pcs/Pack

CK793

88962793

1

12499371

4

CK795

88962795

1

12499372

4

CK797

88962797

1

12499373

4

CK799

88962799

1

12499374

4

CK801

88962801

1

12499375

4

CK803

88962803

1

12499376

4

CK805

88962805

1

12499377

4

CK807

88962807

1

12499378

4

CK809

88962809

1

12499379

4

Part Description

Part Number

Qty

Tires -- Fullsize Truck

P275/55R20 Good Year Eagle LS

09595312

(in Canada, 89033896 or LU069493)

4

Valve Stem Cap

09591607

4

Center Cap

Brushed -- Chevrolet

15766002

4

Brushed -- GMC

88961684

4

Polished -- Chevrolet

88963139

4

Polished -- GMC

88963140

4

Chrome -- Chevrolet

88963143

4

Chrome -- GMC

88963144

4

Lug Nuts

09591772

24

Wheel Lock Kit

12497479

1

Lug Nut Cap

Black

15646250

24

Chrome

15045768

24

Stainless

88963146

24

Jounce Bumper Kit

12499481

1

Knee Bolster Bracket

12499966

1

Parts are currently available from GMSPO.

Warranty Information

Wheels

All GM Accessories sold and permanently installed on a GM vehicle PRIOR to new vehicle delivery will be covered under the provisions of the New Vehicle Limited Warranty.

In the event GM Accessories are installed AFTER new vehicle delivery, or are replaced under the new vehicle warranty, they will be covered (parts and labor) for the balance of the vehicle warranty, but in no event less than 12 months/12,000 miles (in Canada, 12 months/20,000 kilometers). This coverage is only effective for GM Accessories permanently installed by a GM dealer or a GM approved ADI (Accessory Distributor / Installer).

GM Accessories sold over-the-counter, or those not requiring installation, will continue to receive the standard GM Dealer Parts Warranty of 12 months from the date of purchase (parts only).

Tires

Any approved tire installed on a GM Vehicle PRIOR to delivery will be covered under the provisions of the New Vehicle Limited Warranty. Tires are covered against defects in material and workmanship. Tires are warranted for defects "without" prorated charge for tread mileage. Subsequent replacements under this warranty will continue to be covered for the remainder of the New Vehicle Limited Warranty.

Any approved tire installed on a GM Vehicle PRIOR to delivery may continue to be warranted on a prorated basis by the tire manufacturer once the New Vehicle Limited Warranty expires.

Any approved tire installed AFTER delivery will be covered under the provisions of the tire manufacturer warranty.

USA dealers should refer to GM Warranty Administration Bulletin 00-03-10-003E and GM Parts Process / Policy Bulletin IB03-001 for more information.

Canadian dealers should refer to GM Warranty Administration Bulletin 01-03-10-003A.

GM Warranty Claims Processing

Only GM dealerships have the ability to file warranty claims for GM Parts and Accessories. Therefore, any warranty claims filed against such parts must be handled by the servicing GM dealership. This includes those parts purchased from a GM-approved ADI (Accessory Distributor / Installer).

ACCESSORY WHEEL AND TIRE INFORMATION FORM

You have just modified your vehicle by installing an "Accessory Package" which includes Wheels and Tires. This form contains important information about your accessory installation. In an effort to provide superior service to you, our customer, we ask that you please present this form to your Servicing Dealer when removing or installing wheels and tires on your vehicle. This form contains important information necessary to service your vehicle.

VIN: ______________________________________________________________

Original Equipment:

VCI #: _____________________________________________

Tire & Wheel Size: ___________________________________

Accessory Equipment:

VCI #: _____________________________________________

Tire and Wheel Size: _________________________________

Important: Please store this form in the vehicle with your Owner's Manual. A record of this form will also be kept on file at your Servicing Dealer.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

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GM-Tech · July 14, 2005

Every GM dealer has the same access to SI (service information) just like I do. They should be able to find every bulletin related to putting 20 inch wheels on trucks in less than 2 minutes. That's all the time it takes me.