Ford 2004 Expedition Owner's Manual page 334

Maintenance and Specifications
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
U
T
E
J
H
D
R
334
2004 Expedition (exd)
Owners Guide (post-2002-fmt)
USA English (fus)
Transmission Description
Manual transmission
Manual 5–speed overdrive (Mazda R2)
Manual 5–speed overdrive (Close ratio)
Manual 5–speed overdrive (Dana ZF)
Manual 6–speed ZF
Automatic transmission
Automatic 4–speed overdrive (4R70W)
Automatic 4–speed overdrive (4R44E)
Automatic 4–speed overdrive (4R100)
Automatic 5–speed overdrive (5R55E)
Electric
One speed electric
Automatic 5–speed overdrive (5R44E)
Automatic 5–speed overdrive (5R55S)