FORD 2009 F-550 v.3 - Manual (Page 274)

Exceeding these limits may allow water to enter vehicle components:
• causing internal damage to the components.
• affecting driveability, emissions and reliability.
Replace the rear axle lubricant any time the axle has been submerged in
water. Rear axle lubricant quantities are not to be checked or changed
unless a leak is suspected or repair required.
RECREATIONAL TOWING
Follow these guidelines if you have a need for recreational (RV) towing.
An example of recreational towing would be towing your vehicle behind
a motorhome. These guidelines are designed to ensure that your
transmission is not damaged.
Note: Put your climate control system in recirculated air mode to
prevent exhaust fumes from entering the vehicle. Refer to the Climate
controls chapter for more information.
Transmission Drivetrain
configuration
Requirements for
neutral towing
Manual 4x4 with
manual-shift
transfer case
Transmission in (N)
Neutral; Transfer case in
(N) (Neutral); Hublocks
set to FREE 1
Automatic
Manual 4X2 or 4x4 with
electronic-shift
transfer case
Do not tow your vehicle
with any wheels on the
ground, as vehicle or
transmission damage may
occur. It is recommended
to tow your vehicle with all
four (4) wheels off the
ground such as when using
a car-hauling trailer.
Otherwise, no recreational
towing is permitted.
Automatic
1 Always make sure that both hub locks are set to the same position.
In case of a roadside emergency with a disabled vehicle, see Wrecker
towing in the Roadside Emergencies chapter.
2009 F-250/350/450/550 (f23)
Owners Guide, 3rd Printing
USA (fus)
Tires, Wheels and Loading
274