1984 Corvette: Service Bulletin: Transmission Maintenance Information - Four-Speed Manual Transmission with Automatic Overdrive

Subject:   Transmission Maintenance Information - Four-Speed Manual Transmission with Automatic Overdrive
Model and Year:   1984 Corvette
Source:  Chevrolet Dealer Service Bulletin
Bulletin No:   84-213
Section:   OB (VIIb)
Date:    Oct., 1984

TO:  ALL CHEVROLET DEALERS

Some early 1984 Corvettes with four-speed manual transmission 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 Schedule" 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 (GM P/N 1051855) every 30,000 miles (50,000 km).  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 80W 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.

Chevrolet Motor Division
General Motors Corporation