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1956 - 1957 Corvette: Service Bulletin: Conversion From 3-Speed to 4-Speed Transmission

Subject: Conversion From 3-Speed to 4-Speed Transmission
Model and Year: 1956-1957 Corvette
Source: Chevrolet Service Bulletin, Zone #41 Wichita, Kansas
Number: 108
Date: October 8, 1957

A kit is now available containing the required control lever and bracket assembly and linkage to permit installation of a 4-speed transmission in 1956-57 Corvette units equipped with a 3-speed transmission.


Part #Description# Req’d.
3749586 Conversion Kit 1
3742510 Selector Plate 1

Installation instructions are furnished with the conversion kit.

Your very truly,
B.H. Berryhill
Zone Service Manager

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.

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