What type of automatic transmission fluid do i use in 7.3 diesel ford?
It will depend on the year and the transmission model. Most were
designed to use Dexron/Mercon (D/M type) fluid, but later models
may be designed for other types of fluid depending on the model of
It is always best to try to find the information on the vehicle.
Many times it will be stamped onto the transmission dipstick,
something like "check when hot in park with engine running, use
Dexron III type fluid".