INSTRUMENT CLUSTER SERVICE EXCHANGE PROCEDURE OUTLINED. GMC Truck GMC K Pickup

MODELS: 1988 C/K TRUCKS

The 1988 C/K instrument clusters will be serviced on an exchange only basis until July 1, 1987.

To obtain a remanufactured cluster, contact one of the AC Delco repair centers listed in Table One. Provide the VIN, vehicle mileage, and whether the cluster is the standard or deluxe (with gages) cluster. A core charge will be attached to the cluster, which will be removed when the malfunc- tioning cluster is returned with a completed AC Delco 1078 form. The instrument cluster replacement procedure is outlined in the C/K Service Manual, Section 8C-13.

The remanufactured cluster will have the odometer set to the mileage provided, but the speedometer will not be calibrated. Correct speedometer calibration is necessary for an input signal to the rear wheel antilock (RWAL) controller and is affected by tire size and axle ratio. The speedometer calibration chart is on Page 5A3-24 of the 1988 C/K Service Manual. A calibration clip will be provided with the exchange cluster. Follow the speedometer calibration procedure, Steps 3-6 only, Section 5A3-22, of the 1988 C/K Service Manual. Steps 1 and 2 have been performed by the AC Delco repair shop.

Notice: Because of the presence of the rear wheel antilock brake system, locally performed changes to tire size and/or rear axle ratio must be programmed into the speedometer. Separate programming bars will be available from GMSPO within the next few months. A bulletin detailing this information and programming procedures will be released when the parts become available.

Notice: The only speedometer parts currently available through GMSPO are the two cluster lenses.

Part Number 25079967 - base cluster lens Part Number 25079682 - duster lens (with gages)

TABLE ONE Instrument and Display Remanufacture Centers

Name Address Phone Auto Electric 1841 W. Commonwealth 1-800-321-6969 Radio Fullerton, CA 92633 (Outside CA) 1-800-321-6970 (CA only)

Custone Auto 1614 Charles Street 1-800-263-7867 Radio Whitby, Ontario (Canada only) Canada LIN 1B9

D and B Auto 3725 N. 25th Avenue 1-800-323-4813 Radio, Inc. Schiller Park, IL 60176 (Outside IL) 1-800-942-8049 (IL only)

Randazzo Auto 233 Commercial Street 1-800-538-9702 Radio San Jose, CA 95112 (Outside CA) 1-800-662-9877 (CA only)

Specmo Instrument 2344 N. Woodward Avenue 1-800-545-7911 Service Royal Oak, MI 48073 (Outside MI) 1-800-545-7910 (MI only)

Speedometer 3227 Sky Lane 1-800-527-0108 Service, Inc. Carrollton, TX 7500 or 0109 (Outside TX) 1-800-492-9026 (TX only)

Techni-Car,lnc. 5688 W. Crenshaw Street 1-800-822-0022 Tampa, FL 33614 (Outside FL) 1-800-662-0022 (FL only)

United Radio 2949 Erie Boulevard East 1-800-448-0944 Service Syracuse, NY 13224 (Outside NY) 1-800-962-0901 (NY only)

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those 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 a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.