Lincoln 2008 MKX Owner's Manual page 316

The Vehicle Identification Number (VIN) contains the following
information:
1. World manufacturer identifier
2. Brake system / Gross Vehicle
Weight Rating (GVWR) / Restraint
System
3. Vehicle line, series, body type
4. Engine type
5. Check digit
6. Model year
7. Assembly plant
8. Production sequence number
TRANSMISSION/TRANSAXLE CODE DESIGNATIONS
You can find a
transmission/transaxle code on the
Safety Compliance Certification
Label. The following table tells you
which transmission or transaxle
each code represents.
Description
6F50 6–Speed Automatic Transaxle
2008 MKX (mkx)
Owners Guide (post-2002-fmt)
USA (fus)
Maintenance and Specifications
Code
J
315