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1953 - 1967 Corvette Specification Guide
(Transmission Production Code Locations)

Powerglide

1953-57:  Stamped on rear face of case in lower right corner.

1958-1961:  Stamped on rear flange of governor cover.

1962-1967:  On Aluminum Powerglide produced prior to November 11, 1961, the serial numbers is stamped on the right front corner of the case, forward of the oil pan and under the converter underpan.  Serial numbers were then relocated to the bottom center of the oil pan.  Sometime during 1963, serial number stampings were relocated to the right side of the transmission oil pan.

3-speed

1955-1965:  Stamped on right rear face of case.

1965-1967:  Apparently, during 1965, stamping was relocated to the machined surface on left side of case, just below and rear of cover.

Warner 4-speed

1957-1963:  On the left side of the case, on the machined surface in the upper rear corner, just behind the side cover.

Muncie 4-speed

1963-1967: Stamped vertically on the right side of the case at lower rear, just ahead of the transmission extension.

 

Unit Serial Number Identification

Powerglide

1953 (Early, prior to June 30, 1953):  "L" code indicates model-year 1953;  "V" indicates Corvette Powerglide built at Cleveland.  This type code was followed by a sequential unit serial number; Cleveland plant production began with number "1001", regardless of transmission type (Chevrolet passenger car or Corvette).  The serial number may be suffixed by the letters "D" or "N", designating applicable day or night production shifts (when multiple shifts are in operation).

1953-1959 (after June 30, 1953):  Powerglide code "C" (indicating Cleveland plant) was followed by one or two digits indicating month of production ("1" through "12" for January through December), followed by two numerals designating the date of the month ("01" through "31" ).  This serial code may be suffixed by an applicable code "D" or "N" designating day or night shift.

1960-1961:  Unit Production Serial Code should appear as just described, except for January through September month codes supposedly being changed from one to two digits ("01" through "9" ). Note:  The appearance of a suffix letter "W" following the "D" or "N" shift code on some Powerglide transmissions indicates a welded-type torque converter.

1962-1966:  Unit Serial Codes will appear as just described except for aluminum Poweglide prefix codes "B" (1962) and "T" (1963-66) indicating Toledo plant.  Note:  The month codes for January through September may appear as either one ("1" through "9" ) or two ("01" through "9" ) digits.

1967: Unit coding method changed significantly.  Prefix "T" (Toledo Powerglide) was followed by the last digit of the vehicle model year ("7"); a letter representing the month to transmission manufacture (see month chart); followed by two digits designating the date of the month ("1" through "31" ).

 

Calendar Month Codes

                   A - January               E - May             P - September

                   B - February             H - June            R- October

                   C - March                   K - July             S - November

                   D - April                     M- August        T - December

 

 

Saginaw 3-speed & Muncie 4-speed

 

The method of unit production serial coding for 1955-67 Corvette speed and 1963-67 Muncie 4-speed manual transmissions is the same as described for Powerglide transmissions, except for the prefix codes ("S", "SU", or "P") listed.

 

Warner 4-speed

1963-1967: The transmission type suffix code ("W") will be followed by a letter indicating month of manufacture ("A" for January, "B" for February, and so on); one or two digits indicating the date of the month ("1" through "31" ); followed by a single digit representing the calendar year of manufacture and "1", "2" or "3" indicating applicable work shift.

 

Note:  During the 1960 model year, in addition to the transmission unit serial number codes just described, Chevrolet began the practice of adding a (hidden) vehicle identification  serial number (VIN) derivative stamping to each transmission installed in a Corvette at St. Louis Assembly Plant, in the same manner used for engines.  This number was often stamped near the production code on manual transmissions; locations varied on automatic transmissions.

 

1953-67 Corvette Horns

 

Year Low-Note High-Note Relay
1953 1999631 1999632 1116775
1954 1999687 1999688 1116775
1955 1999759 1999760 1116781
1956 1999759 1999760 1116913
1957* 1999759 1999760 1116913
1957** 9000339 9000340 1116913
1958 9000351 9000352 1116913
1959-60 9000351 9000352 1116781
1961-62 9000441 9000442 1116781
1963 9000455 9000456 1115824
1964-65 9000487 9000488 1115824
1966-67 9000487 9000488 1115837

 * 1st Design            **2nd Design

 

Note: 1955 listing reflects V8-equipped 12-volt models; 1955 6-cylinder models use same horn equipment as 1954 model.  All 1953-1963 Low-note horns mounted on right-hand side; High-note on left-hand side.  All 1964-1967 Low-note horns mounted on left-hand side; High-note on right-hand side.

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