FORD 2004 F-150 v.3 - Manual (Page 287)

Engine number
The engine number (the last eight numbers of the vehicle identification
number) is stamped on the engine block and transmission.
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 Transmission Description
Manual transmission
M Manual 5–speed (AKK))
C Manual 5–speed overdrive (Close ratio)
W Manual 5–speed overdrive (Dana ZF)
G Manual 6–speed ZF
Automatic transmission
Y Automatic 4–speed overdrive (CD4E)
U Automatic 4–speed overdrive (4R70W)
T Automatic 4–speed overdrive (4R44E)
E Automatic 4–speed overdrive (4R100)
2004 F150 (f12)
Owners Guide (post-2002-fmt)
USA English (fus)
Maintenance and Specifications
287