Ford 2008 F-250 Owner's Manual page 297

Roadside Emergencies
Note: Towing an a 4x2 or an ESOF 4x4 vehicle with the rear wheels on
the ground for more than 50 miles (80 km) and/or in excess of 35 mph
(56 km/h) may cause damage to the automatic transmission.
Note: On Dual Rear Wheel (DRW) vehicles, an outer rear wheel must be
removed prior to using a wheel lift wrecker.
If the vehicle is towed by other means or incorrectly, vehicle
damage may occur.
Ford Motor Company produces a towing manual for all authorized tow
truck operators. Have your tow truck operator refer to this manual for
proper hook-up and towing procedures for your vehicle.
297
2008 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)