FORD 2005 Taurus v.3 - Manual (Page 244)

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
L Automatic overdrive
2005 Taurus (tau)
Owners Guide (post-2002-fmt)
USA (fus)
Maintenance and Specifications
244