Ford Mariner Owner's Manual page 328

Maintenance and Specifications
The Vehicle Identification Number (VIN) contains the following
information:
1. World manufacturer identifier
2. Brake system / Gross Vehicle
Weight Rating (GVWR) / Restraint
Devices and their location
3. Make, vehicle line, series, body
type
4. Engine type
5. Check digit
6. Model year
7. Assembly plant
8. Production sequence number
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
Six-speed automatic
328
2010 Mariner (mrn)
Owners Guide, 2nd Printing
USA (fus)
Code
6