The best way to ID one of these transmissions would be to get the letter code off the tag on the side of the transmission case. If this code is not available, then you can measure the length of the case from the front to the back, not including the bell housing or extension housing. Use the chart below for more details...

 

 

SMALL CASE = 9 7/8" Case Length (1951-1970)

 

IP - 1951-1954 Ford, Mercury 215, 223, 239, 255

PAD - 1953-1954 F100 215, 223, 239

PAE - 1954 Mercury 256

PAG - 1955 Ford 223

PAH - 1955 F100 223, 239

PAJ - 1955 F250, F350 223,239

PAK - 1955 Ford 272

PAP - 1956 Ford 223

PAR - 1956 Ford 272, 292, 312

PAS - 1956 F100 223

PAT - 1956 F100 272

PAU - 1956-1962 F250, F350, P350, P500 223

PAV - 1956-1958 F250, F350, P400, P500 272

PAY - 1957-1962 Ford 223

PAZ - 1957-1960 Ford, Edsel 272, 292, 312, 332

PBC - 1957-1962 F100, F250 223

PBD - 1957-1958 F100, F250 272

PBM - 1958-1961 Ford, Mercury 312, 332, 352

PBW - 1958-1962 F100, F250 292

PBY - 1958-1962 F350, P350, P500 292

PCC - 1961-1962 Ford, Mercury 292

PCD - 1961-1962 Ford, Mercury 352

PCT - 1963-1966 Ford, Mercury 260, 289

PMA - F250, P350 215, 223, 239

 

 

 

MEDIUM CASE = 10 1/4" (1955-1972)

 

PAN - 1956-1957 Lincoln, Mercury 368

PAW - 1956 Ford, Mercury 312

PBA - 1957 Ford, Mercury 312

PBL - 1958-1960 Ford, Mercury, Edsel 352, 361, 383

PCE - 1961-1962 Ford, Mercury 390

PMB - 1955 Ford, Mercury 292

PMC - 1955 Lincoln 341

PME - 1956 Ford 312

 

 

 

LARGE CASE = 10 7/8" (1958-1960)

LARGE CASE = 11 5/8" (1961-1965)

 

PBB - 1958-1960 Ford, Mercury, Lincoln 383, 410, 430

PCA - 1961-1965 Lincoln 430

 

 

FMX = 9 7/8" (1968-1981)

FMX units are very similar to a Small Case, but they are not the same.

FMX units do not have a rear pump, and the filler tube goes into

the case (not the oil pan).

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