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TRANSMISSION IDENTIFICATION
The transmission identification code will differ depending the type of
transmission - Manual, Powerglide or Turbo Hydra-Matic 400.
The manual and Powerglide will have a production code consisting of a
prefix letter designating the assembly plant, a production date (year/month
letter/day number) and a shift code for day or night shift if the assembly
plant was using two shifts.
The Turbo Hydra-Matic 400 was new to the 1967 Chevelle and coding used
a different format. This production code consists of a two-digit model year
(67) followed by an engine/model code letter and a three-digit production
date. The three-digit production date begins with the first day of
January, 1966. For example, a production date of 298 would be October 25,
1966 or, the 298th day. January 1 of 1967 would be 366.
A Julian date
calendar can be found here to assist you. Remember, a production date
of 001 to 365 is calendar year 1966 and 366 or higher is calendar year 1967.
If the production date is over 365, subtract 365 and find the corresponding
Julian date for 1967. It's not known when the last TH400 was installed
in a 1967 Chevelle, but assuming July 31 the last model build day, a date
of 577 should be the largest date. July 31, 1967 (577) is the 212th day
of 1967. Subtracting 365 from 577 gives you 212 - July 31, 1967.
| Manual and Powerglide Transmission Designations |
| 3-speed |
4-speed |
Powerglide |
Turbo Hydra-Matic 400 |
D - Saginaw (3-speed w/overdrive)
**
O - Saginaw (3-speed w/overdrive) **
M - Muncie
H ~ Muncie H.D.
K - McKinnon Industries
S - Saginaw
W - Warner Gear |
N - Muncie
P - Muncie
R - Saginaw |
C - Cleveland
E - McKinnon Industries
*T - Toledo
|
X - Cleveland
B - Cleveland
Y - Toledo |
** One source shows
the letter 'D' and one source shows the letter 'O'.
The coding of the Muncie 4-speed manual transmission changed in
1967. A letter now designated the month and the model year was included.
For example, P7A01 breaks down to P (Muncie), 7
(1967 model year), A (January), 01 (day). Any Muncie build in
calendar year 1966 for an August
through December built 1967 model
year would be dated with M through T (August through December) such
as P7R25 meaning the transmission was coded for a 1967 model year
Chevelle and built on October 25, (calendar year) 1966. |
| Year - 7 |
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| Calendar Month |
| M - August |
P - September |
R - October |
|
| S - November |
T - December |
A - January |
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| B - February |
C - March |
*D - April |
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| E - May |
H - June |
K - July |
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Day Number
1...31 |
Powerglide Transmission
Variations have been found for Powerglide transmission designations.
Normal code would be the plant letter, model year, month/day such
as T7C14 for Toledo (T), 1967 (7) April 25 (D25). This POP also
includes the letter "D" for Day shift. |
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Turbo Hydra-Matic 400 Transmission
A sample TH400 code would be 67C298 where "C" indicates
a Chevelle or Camaro w/396 engine and 298 indicates October 25,
1966.
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