Ford AM/FM stereo Owner's Manual page 238

Maintenance and Specifications
Certification label for incomplete vehicles
On completed derivations of incomplete vehicles, the certification label is
affixed at a location determined by a subsequent stage manufacturer of
the completed vehicle. In these cases the completed vehicle is
manufactured in two or more stages by two or more separate
manufacturers.
TRANSMISSION/TRANSAXLE CODE DESIGNATIONS
You can find a transmission/transaxle code on the vehicle certification
label which is located on the door pillar. The following table tells you
which transmission or transaxle each code represents.
TRUCK APPLICATION:
Code
M
C
W
G
Y
238
Transmission Description
Manual transmission
Manual 5–speed (AKK))
Manual 5–speed overdrive (Close ratio)
Manual 5–speed overdrive (Dana ZF)
Manual 6–speed ZF
Automatic transmission
Automatic 4–speed overdrive (CD4E)