See Figures 1 and 2
The Muncie 3-speed manual transmission serial number is located on the lower left side of the case, adjacent to the rear of the cover.
The New Process 4-speed transmission is numbered on the rear of the case, above the output shaft.
The Muncie 117mm 4-speed transmission is numbered on the rear of the case, above the output shaft.
The NVG 4500 5-speed transmissions are numbered on the top, left side of the case, near the bell housing.
The Turbo Hydra-Matic is identified by a plate attached to the right side, which is stamped with the serial number.