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TRANSMISSION IDENTIFICATION
The transmission identification code will differ depending the type of
transmission - Manual, Powerglide, Turbo Hydra-Matic 350, 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 used a different date
coding format. This production code consists
of a two-digit model year (69) 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, 1968. For example, a production
date of 299 would be October 25, 1968 or, the 299th day of the 1968
calendar year. (1968 was a leap
year, 366 days). January 1 of
1969 would be 367.
A Julian
date calendar can be found here to assist you. Remember, a production
date of 001 to 366 is calendar year 1968 and 367 or higher is
calendar
year 1969. If the production date is over 366, subtract 366 and find
the corresponding Julian date for 1969. It's not known when the last
TH400 was installed in a 1969 Chevelle, but assuming July 31 the last
model build day, a date of 578 should be the largest date. July 31,
1969 (578) is the 212th day of 1969. Subtracting 366 from 578
gives you 212 - July 31, 1969.
| Manual and Powerglide Transmission Designations |
| 3-speed |
4-speed |
Powerglide |
Turbo Hydramatic 350 |
D - Saginaw (3-speed
w/overdrive) **
O - Saginaw (3-speed w/overdrive) **
M - Muncie
K - McKinnon Industries
S - Saginaw
W - Warner Gear |
N - Muncie
P - Muncie
R - Saginaw |
C - Cleveland
E - McKinnon Industries
T - Toledo
|
X - Cleveland (prior to
8/12/68)
B - Cleveland
Y - Toledo |
** One source shows the letter 'D' and one source
shows the letter 'O'.
Once again the coding for the Muncie 4-speed changed in 1969,
but only slightly. The basic code remained the same with the
letter designating the month and the model year was included.
For example, P9A01A breaks down to P
(Muncie), 9 (1969 model year), A (January), 01 (day), M20 . Any Muncie
build in calendar year 1968
for an August through December built 1969
model year would be dated
with M through T (August through December) such as P9R25A meaning
the transmission was coded for a 1969 model year Chevelle on
October 25, (calendar year) 1968. A letter suffix code was added
in 1969 to identify the M20, M21, and M22 series; "A" for the M20,
"B" for the M21,
or "C" for the M22. |
| Year - 9 |
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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 2-speed and Turbo Hydra-Matic 3-speed
Automatic Transmission
B - Cleveland (TH350)
C - Cleveland (PG)
Y - Toledo (TH350)
Variations have been found for Powerglide and TH350 transmission
designations. Normal code would be the plant letter, model year,
month/day such as B9C14 for Cleveland (B), 1969 (9) March 14 (C14).
A Turbo Hydra-Matic 350 would be coded like Y9B26 for Toledo
(Y), 1969 (9), February 26 (B26). |
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Turbo Hydra-Matic 400 3-speed Automatic Transmission
*A sample TH400 code would be 69C223 where "C" indicates a Chevelle
or Camaro w/396 engine and 223 indicates August 10, 1968. (1968 was a leap year)
The 3rd character (letter) is designated as follows:
A - 350 cid/255 hp
C - 396 cid/325 hp
D - 350 cid/250 hp
E - 396 cid/350 hp
F - 396 cid/350 hp (Fremont)
Y - 396 cid/375 hp (high shift point)
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