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Dynaflow:

NOTE: Following markings are stamped on aluminum plate low on the transmission, on left side and between the main transmission case and the front pump housing.
IDENTITY
LETTER
USAGE
H '53 40 ser.
J '53 50, 70 ser.
K or M '54 40,60 ser.
P '56 All
R '57 All
S '58 All
T '55 50, 70 ser.
W '59 All