FORD 2011 F-550 v.2 - Manual (Page 411)

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.
Code Description
T Five-speed automatic (5R110W)
P Six-speed automatic (6R140)
Maintenance and Specifications
411
2011 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)