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1974 - 1975 Corvette: Service Bulletin: Stripped Speedometer Driven Gear

Subject:  Stripped Speedometer Driven Gear
Model and Year: 1974 - 1975 Corvette with 4-Speed Transmission
Source: Chevrolet Dealer Service Technical Bulletin
Bulletin No: 75-T-3
Section:  XII
Date: January 17, 1975

To:  All Chevrolet Dealers:

On 1974  and 1975 Corvettes with 4-speed transmission, an inoperative speedometer due to a stripped riven gear may be the result of high internal friction in the speedometer adapter.

A new low friction adapter and key will be phased into production in January, 1975 and will be available for service under the numbers listed below:

1565211 ---- Adapter
6476970 ---- Key

For service, vehicles exhibiting this problem may be corrected by the following method:

  1. Remove driven gear and replace with new gear of same part number and color.
  2. Remove and discard production adapter and key and install new adapter and key.


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.

© Copyright General Motors Corporation. All Rights Reserved

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