FORD 2005 Excursion v.2 - Manual (Page 266)

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
B Five-speed automatic, TorqShift
E Four-speed automatic (4R100)
2005 U137 Excursion (hdw)
Owners Guide (post-2002-fmt)
USA_English (fus)
Maintenance and Specifications
266