TRANSMISSION MAINTENANCE INFO AUTO OVERDRIVE-4 SPEED MANUAL. Chevrolet Corvette 1984

VEHICLES AFFECTED: 1984 Corvettes Equipped With Four-Speed Manual Transmission With Automatic Overdrive

Some early 1984 Corvettes with four-speed manual tranamission with automatic overdrive have maintenance schedules that did not include the mileage factor for fluid change in the automatic overdrive portion of the transmission.

The 'Corvette Owners Manual' and the 'General Motors Maintenance Schedulel for 1984 has been reissued to include a fluid replacement requirement. It is recommended that the fluid in the overdrive unit be replaced with DEXRON II automatic transmission fluid every 50,000 km (30,000 miles). The manual transmission fluid does not require changing.

REFILLING OR CHECKING THE MANUAL TRANSMISSION WITH AUTOMATIC OVERDRIVE

Check the fluid level only when the transmission is cold, the engine off, and the vehicle is level.

Manual Transmission (4-Speed)

For checking or refill, the fluid level should be at the level of the filler plug hole located on the passenger side of the 4-speed case. Use SAE SOW GL-5 gear lubricant if additional lubricant is needed.

Overdrive

For checking or refill, the fluid level should be at the level of the filler plug hole located on the driver's side of the overdrive case. Use DEXRON II automatic transmission fluid.

DEXRON GM P/N 992799 1L 992800 4L

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.