LOW SPEED SURGE (CHUGGLE) PROM INFORMATION-TCC

VEHICLES AFFECTED: 1984 Corvette With Automatic Transmission

Some 1984 Corvettes may experience a low speed surge, which may be referred to as a 'chuggle', and is usually noticeable at low engine speeds when the torque converter clutch is engaged.

Any 1984 Corvette with an automatic transmission experiencing this condition may be corrected with the installation of a new calibration PROM, P/N 1226938.

The new PROM calibration delays TTC engagement speed to 66 kph in fourth gear and disengagement speed 64 kph.

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.