1963 - 1965 Corvette: Service Bulletin: Rear Suspension Crossmember Isolation Mounts Pulling Loose
Subject: Rear Suspension Crossmember Isolation Mounts Pulling Loose
Model and Year: 1963, 1964, 1965 Corvette
Source: Chevrolet Technical Service Bulletin
Bulletin No: TSB #1036
Date: September 15, 1964
TO: ALL CHEVROLET SERVICE PERSONNEL
Under certain driving conditions on 1963, 1964 and 1965 Corvettes, the rear suspension isolation mount retaining tabs do not prevent the isolation mount from pulling out of the rear crossmember.
A new isolation mount, with increased retaining tab area, will be released in interim 1965. This new mount will service back to 1963 vehicles, and when released may be used if the above problem is encountered.
Meanwhile, the method outlined on the following page should be used whenever the loosening problem is encountered or new mounts are installed.