CAMPAIGN:OVERDRIVE SWITCH REPLACE INOP WIRED SWITCH
MODEL AND YEAR: 1986 CHEVROLET CORVETTE MODELS EQUIPPED WITH RPO MK2 MANUAL TRANSMISSION
General Motors has determined some early 1986 Chevrolet Corvette models equipped with RPO MK2 manual transmission may have been assembled with an improperly wired overdrive switch.
This switch will not allow the transmission to automatically be in overdrive upon restart as was intended. All other functions relating to the overdrive feature, including driver initiated overdrive activation, perform as intended.
To prevent this condition from occurring, a new overdrive switch will be installed.
VEHICLES INVOLVED
Involved are certain early 1986 Chevrolet Corvette models equipped with RPO MK2 manual transmission within the following vehicle parameters:
PLANT FROM THROUGH ----- ---- ------- Bowling Green G5100002 G5106310
Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle Identification Number, owner name and address data, and are furnished to the involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.
These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of Owner Letter included with this bulletin).
DEALER CAMPAIGN RESPONSTBILITY
Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.
Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing vehicle.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.
PARTS INFORMATION
Parts required to complete this modification are to be obtained from General Motors Warehousing and Distribution Division (GMWDD). To ensure these parts will be obtained as soon as possible, they should be ordered from GMWDD on a C.I.O. order with no special instruction code, but on an advise code (2).
PART QUANTITY NUMBER PER VEHICLE DESCRIPTION ------ ----------- ----------- 14087693 1 Overdrive Switch
PARTS SHOULD BE ORDERED ONLY WHEN DEALERS HAVE INVOLVED VEHICLES CURRENTLY ASSIGNED PER ATTACHED VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS.
SERVICE PROCEDURE
OVERDRIVE SWITCH
Removal
1. Disconnect negative cable at battery.
2. Remove the screws retaining trim plate for the instrument cluster. Remove the knob for the headlamp switch, lever for tilt steering column and then the trim plate.
3. Remove the screws retaining T.P. accessory trim plate and then remove the trim plate.
4. Remove the screws retaining console trim plate. Pull trim plate back and disconnect electrical lead for cigarette lighter. Remove screws retaining shift boot to trim plate, then remove trim plate.
5. Remove the O/D switch button from the shifter knob. Use care when prying button from the knob to prevent damaging the knob or button.
6. Remove the rod for the O/D switch from the shifter. Count the number of turns required to remove the rod.
7. Loosen the nut retaining the switch to the shifter and remove the switch and slide block from the shifter.
Care must be taken to prevent the loss of the return spring located in the slide block.
8. Disconnect the electrical lead for the switch.
9. Remove the pin retaining the switch to the slide block.
Installation
1. Position the switch to the slide block and install retaining pin.
2. Compress the return spring in the slide block using a small screwdriver, then position the switch and block on the shifter.
3. Tighten the switch retaining nut.
4. Install the O/D switch rod in the shifter. Screw the rod into the slide block the same amount of turns it took to remove. Install the switch button. The button should be flush with the top of the shift knob. If it is not, remove the button and turn the rod in or out to make it flush.
5. Connect electrical lead for the switch.
6. Position the console trim plate to the shifter boot and install retaining screws.
7. Connect the electrical lead for the cigarette lighter.
8. Position the console trim plate and install the retaining screws.
9. Position the I.P. accessory trim plate and install the retaining screws.
10. Position the instrument cluster trim plate and install the retaining screws. Install the knob for the headlamp switch and the lever for the tilt steering column.
11. Connect negative cable at battery.
12. Install Campaign completion label.
CLAIM INFORMATION
Submit a Product Campaign Claim with the information indicated below:
* FAILED PARTS LABOR LAB OTH REPAIR PERFORMED PC PART NO. ALLOW FC OP HRS HRS ---------------- -- -------- ----- -- ----- --- --- o REPLACE MANUAL TRANS. 1 14087693 ** 00 V3530 .7 .1 OVERDRIVE SWITCH
*Campaign Administrative Allowance. **The "Parts Allowance" should be the sum total of the current GMWDD Dealer Net price plus 30% of all parts required for the repair.
Dealers will automatically receive the correct labor and material allowance based an the labor operation performed.
Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle modified in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the five digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint pen.
Each "Campaign Identification Label" is to be located an the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.
Apply "Campaign Identification Label" only on a clean dry surface.
----------------------------------------------------------------------------- (Notification Used By Chevrolet Motor Division)
Dear Chevrolet Owner:
General Motors has determined some early 1986 Chevrolet Corvette models equipped with a manual transmission may have been assembled with an improperly wired overdrive switch. This switch will not allow the transmission to automatically be in overdrive upon restart as was intended. Currently your transmission will be in the non-overdrive mode and the overdrive switch must be activated to be in overdrive. When the switch is replaced your transmission will then be in the overdrive mode upon restart and it will be necessary for you to switch to the non-overdrive mode if you desire that position.
As mentioned above, this condition will be corrected by installation of a new overdrive switch. This service will be performed for you at no charge.
Instructions for this service have been sent to your Chevrolet Dealer. Please contact your dealer to arrange a service date. The time necessary to make this modification is approximately forty-five (45) minutes. Please ask your dealer how much additional time will be necessary to process your vehicle.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.
Chevrolet Motor Division GENERAL MOTORS CORPORATION
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.
