Automatic Transmission Fluid - Ford class A chassis Owner's Manual

Applying too much pressure on the ends
when lifting a battery could cause acid to
spill. Lift the battery with a carrier or
with your hands on the opposite corners.

Automatic Transmission Fluid

Under normal driving conditions automatic
transmission fluid should be changed every
21,000 miles (34,000 km) under severe duty
conditions. However, if the transmission is not
working properly, for instance, the transmission
may slip or shift slowly, or you may notice
some sign of fluid leakage, the fluid level should
be checked.
Transmission fluid, filter and seal assembly
should be changed every 21,000 miles
(34,000 km) only under any of the following
conditions.
Extended periods of high speed driving
during hot weather at/or above +90˚F
(+30˚C).
Towing a trailer for distances over 1,000 miles
(1,600 km) per trip.
Accumulating 5,000 miles (8,000 km) or more
per month.
Continuous operation and/or extensive idling
(a delivery service as an example).
Operating in severe dust conditions.
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