in response to a message on the Forum # 346470
63 Shifter "Buzzing solution with 1963 Factory Technical Service Bulletin Number DR#595 May 16, 1963
TSB or Technical Service Bulletins are service notices that were mailed to GM dealerships to solve unanticipated problems. During warranty and service the GM dealerships reported these problems to the GM central office, which then devised a "fix" and then alerted all franchised dealers of the solution via these bulletins. In the 1960's Chevrolet bulletins were Yellow and varied in length, depending upon the problems to be solved.
The 4 page bulletin pictured below addresses the buzzing by inserting a modified plastic manual window crank bearing onto the cross shaft that the shifter main shaft pivots upon.