SECTION 4-C 1951 BUICK DYNAFLOW SPECIFICATIONS, DESCRIPTION, AND OPERATION 4-15 1951 BUICK DYNAFLOW GENERAL SPECIFICATIONS 1951 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 [...]