Lincoln 2011 MKS Owner's Manual page 342

Maintenance and Specifications
TRANSMISSION CODE DESIGNATIONS
You can find a transmission code on
the Safety Compliance Certification
Label. The following table tells you
which transmission each code
represents.
Description
6-speed automatic transmission (6F50)
6-speed automatic transmission (with
EcoBoost) (6F55)
342
2011 MKS (mks)
Owners Guide, 2nd Printing
USA (fus)
Code
J
C