FORD 2004 F-550 v.3 - Manual (Page 299)

1. World manufacturer identifier
2. Brake type and gross vehicle
weight rating (GVWR)
3. Vehicle line, series, body type
4. Engine type
5. Check digit
6. Model year
7. Assembly plant
8. Production sequence number
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.
2004 F250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA English (fus)
Maintenance and Specifications
299