From Ford Tech Service bulletin Sep/Oct 2009:
Approval to Service ALL 5R110 Automatic Transmissions with MERCON« LV
Beginning immediately ALL (2003 to 2010 MY) 5R110 automatic transmissions can be serviced with MERCON« LV automatic transmission fluid in place of MERCON« SP.
Initially only the 2009/10MY 5R110 automatic transmissions were filled and serviced with MERCON« LV. In an effort to reduce complexity, Ford Motor Company is allowing all previous model year 5R110 automatic transmissions to be serviced with MERCON« LV automatic transmission fluid. This pertains to top off as well as fluid replacement. Mixing of MERCON« LV and MERCON« SP in the 5R110 transmission is acceptable. Extensive testing has been performed to insure there are no functional or durability concerns with the use of MERCON« LV in the 5R110 automatic transmission.
Vehicles affected are F-Series Super Duty trucks (including chassis cab, motorhome, LCF).
Motorcraft MERCON« LV is now available in three sizes:
Part Number: XT-10-QLVC - 1 quart
Part Number: XT-10-DLV - 55 gallon drum
Part Number: XT-10-BLV - Bulk
Further information can be found in the Workshop Manual, Section 307-1, Automatic Transmission
Mercon LV vs SP - Diesel Forum - TheDieselStop.com
The link in this post is broken. I'm still looking for the exact number.