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Refrigerant... it's only Freon if it was manufactured by Dupont and marketed under that name... and a 2000 model year vehicle will use R134a refrigerant and PAG compressor oil.
134a refrigerant
According to the 1996 Ford F-250 owners manual : Motorcraft MERCON automatic transmission fluid - Ford part number : XT - 2 - QDX Ford specification : MERCON ( for the C6 / 4R70W / E4OD automatic transmissions )
r134
R134a
R-134a
R134-a
It uses R134a
R-134A
R134a
R-134a
Motorcraft MERCON automatic transmission fluid ( for the C6 / 4R70W / E4OD automatic transmissions ) - according to the owners manual