More than likely a 3.07 gear ratio. Could also be a 2.92/3.23 etc. On the '64 if you clean the very bottom of the carrier, right in the center, you should find some numbers. 07 would mean 3.07. 23=3.23/42=3.42/92=2.92, etc. The Buick gears are 9 3/8ths. ring gear with 12 bolts holding on the ring gear to the case. There is NO other rear gears that fit the Buick's. If the fill plug has a 3/4" square it's a Posi unit. If the fill plug has a 3/8" square you can fit a 3/8" extension into it's an open rear.
Tom Telesco
Classic and Muscle Automotive
12 Cook St.
Norwalk, CT 06853-1601
Day Phone 203-324-6045 ET
NailHead Mini-Starters '53-'66
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