What is the Transmission fluid capacity 1986 Ford F 250 6.9 liter diesel?

The transmission fluid capacity for a 1986 Ford F-250 with a 6.9L diesel engine depends on the type of transmission it has. Ford offered several different transmissions in that year and model. You'll need to identify your transmission type (e.g., ZF-5, etc.) to find the correct capacity.

Unfortunately, I cannot definitively tell you the capacity without knowing the transmission. Consult your owner's manual, or look for a tag on the transmission itself for the identification code. Once you have that, you can search online (e.g., on Ford forums or parts websites) for the specific fluid capacity for your transmission.