How does one distinguish between a 1955 and a 1956 Powerglide transmission? A friend advises me that, based on information contained in Corvette by the Numbers, the identification code on a '55 is identical to the id code on a '56 (i.e., 3708188). Also, I understand that the portion of the '53 to '55 NCRS Judging Manual (page 62) describing the date code for a '55 Powerglide is virtually identical to the corresponding description of the date code for a '56 as contained in the '56 to '57 JM. Specifically, both JMs state that the date code begins with a "C" (for Cleveland), followed by one or two digits for the month (1 to 12), followed by two digits for the day of the month (01 to 31), followed by "D" for day shift or "N" for night shift (which obviously means there must be a minimum of 3 digits in this alphanumeric code).
If the id number for both a '55 and a '56 Powerglide is the same, and if there is no reference in the date code of either to the "year" (but rather simply the month and day), how are the two Powerglides distinguishable? Also, has anyone heard of a date code for such transmissions that contains only two digits (versus 3 or 4) following the "C" and if so, what does this mean? Thanks,
Mike H.
If the id number for both a '55 and a '56 Powerglide is the same, and if there is no reference in the date code of either to the "year" (but rather simply the month and day), how are the two Powerglides distinguishable? Also, has anyone heard of a date code for such transmissions that contains only two digits (versus 3 or 4) following the "C" and if so, what does this mean? Thanks,
Mike H.
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