1956 - 1957 Corvette: Service Bulletin: Lubricant Leakage 3-Speed Close Ratio Transmission
Subject: Lubricant Leakage 3-Speed Close Ratio Transmission
Model and Year: 1956 - 1957 Corvette
Source: Chevrolet Service Bulletin
Bulletin No: 88
Zone: #41 Wichita, Kansas
Date: Aug., 1985
Due to design differences, the 3-speed close ratio, Corvette type, transmission does not contain a lubricant return groove in the front bearing bore like that used in the conventional transmission. A special sealed bearing #900533 is used to prevent passage of oil into the clutch chamber.
In some instances the close ratio transmission case has been replaced because it was believed to be defective.
Yours very truly
Zone Service Manager