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You fill the transmission fluid on the 1988 F250 diesel at the dipstick of the transmission. You will need a filler funnel in order to keep spillage to a minimum.
The 1994 takes Mercon transmission fluid
Motorcraft fluids
Not sure what year your truck is, but up to 2007 uses Ford Mercon ATF (auto transmission fluid).
I believe that the type of fluid to use is engraved into the automatic transmission fluid level dipstick
Every 30,000 miles
Mercon V if it has an A/T.
Store under the drain pan of the transmission.
26.4 pints or 11.2 litres
Motorcraft MERCON ATF ( automatic transmission fluid ) according to the owners manual
Motorcraft MERCON automatic transmission fluid ( for the C6 / 4R70W / E4OD automatic transmissions ) - according to the owners manual
should be atf but check owners manual for more information