INFORMATION ON VIBRATION (LT1) AT 3800-4200 ENGINE RPM RANGE

DCS MESSAGE

SOME OWNERS OF 1992 CORVETTES WITH LT1 ENGINES AND MANUAL TRANSMISSIONS MAY EXPERIENCE VIBRATION IN THE 3800-4200 ENGINE RPM RANGE.

THIS CONDITION CAN BE OBSERVED BY CAREFULLY INCREASING ENGINE SPEED TO 3000-5300 RPM; WITH VEHICLE STANDING STILL PARKING BRAKE APPLIED AND CLUTCH DEPRESSED FULLY TO FLOOR.

IF YOU ENCOUNTER THIS CONDITION, REPLACEMENT OF DRIVELINE COMPONENTS WILL NOT HELP.

PLEASE CONTACT THE CHEVROLET TECHNICAL ASSISTANCE NETWORK (TAN) MISCELLANEOUS GROUP.

PLEASE COMMUNICATE THIS INFORMATION TO YOUR SERVICE MANAGER.

DISCLAIMER

COPYRIGHT 1991 CHEVROLET MOTOR DIVISION, GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.

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.