FORD 2013 Expedition v.1 - Manual (Page 262)

Replace the rear axle lubricant anytime the rear axle has been
submerged in water. Water may have contaminated the rear axle
lubricant, which is not normally checked or changed unless a leak is
suspected or other axle repair is required.
WRECKER TOWING
Note: Vehicles equipped with air suspension must turn off the air
suspension control and ignition switch prior to towing. See Air
suspension in the Driving Aids chapter.
If you need to have your vehicle towed, contact a professional towing
service or, if you are a member of a roadside assistance program, your
roadside assistance service provider.
It is recommended that your vehicle be towed with a wheel lift and
dollies or flatbed equipment. Do not tow with a slingbelt. Ford Motor
Company has not approved a slingbelt towing procedure. If the vehicle is
towed incorrectly, or by any other means, 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.
262 Towing
2013 Expedition (exd)
Owners Guide gf, 1st Printing
USA (fus)