SECTION 5-A 1954 BUICK DYNAFLOW SPECIFICATIONS, DESCRIPTION AND OPERATION 5-1 1954 BUICK DYNAFLOW TRANSMISSION SPECIFICATIONS 1954 Buick Dynaflow Transmission Identification Number A production identification number is stamped into the lower edge of the reaction shaft flange directly to rear of the high (left) accumulator. The identification number consists of a letter followed by a number. See figure [...]