Truck Transmission Production Code Explanation

Muncie Manual Transmission Production Code Explanation

The production code number contains the source code, model year and build date.


EXAMPLE:


N 3 D 10

SOURCE CODE MODEL YEAR BUILD MONTH DAY CODE

S = 3-Speed 1983 A - Jan. 10th
(Saginaw Type) B - Feb.
C - March
N = 4-Speed D - April
(117 mm) E - May
H - June K - July M - Aug. P - Sept. R - Oct. S - Nov. T - Dec.


3-Speed (Saginaw Type)

The code is stamped on the left side of the case just below the side cover.


Muncie Truck 4-Speed

Stamped on the rear face of the transmission case just below the rear retainer.


New Process 205, 207 and 208 Model 4-Wheel Drive Transfer Case

The build date showing the month, day and year along with the Chevrolet part number is on a metal tag attached to the front face of the transfer case at PTO cover.

TRUCK FOUR-SPEED ISUZU TRANSMISSION (77.5 MM):

Truck Four-Speed Isuzu Transmission (77.5 mm)

Right side of bell housing at 3:00 o'clock position five digit ink stamp transmission serial number. Below serial number is five digit ink date stamp.
350C & 700-R4 Turbo Hydra-Matic Transmissions

Refer to the passenger section of this bulletin for production code explanations.