FORD 2005 Crown Victoria - Manual (Page 248)

Engine number
The engine number (the last eight numbers of the vehicle identification
number) is stamped on the engine block, transmission, frame and
transfer case (if equipped).
Transmission/Transaxle code designations
You can find a transmission/transaxle code on the vehicle certification
label. The following table tells you which transmission or transaxle each
code represents.
Code Description
W
Four-speed automatic overdrive (4R70E) -
Livonia
X
Four-speed automatic overdrive (4R70E) -
Sharonville
2005 Crown Victoria (cro)
Owners Guide (post-2002-fmt)
USA_English (fus)
Maintenance and Specifications
248