Is there any specific transmission oil for ford 1998?

Is there any specific transmission oil for ford 1998? - 1

Which Ford? Manual or automatic?

Yes there's. Have them look it up for you at the auto parts store.

MERCON /DEXTRON is what's recommended CVT trans DO NOT USE MERCON /DEXTRON they use special fluid specifically for CVT trans. Just make sure its a CVT ( which i don't think it is but it depends next time state the model with the year ) Pull the DIP stick for the trans it will or should say the type necessary for your car

If you pull your dip stick it will say on it dexron i believ is the correct oil for ford products

Always make sure you get the right fluid. What works in one transmission is the wrong type for a different transmission. There's not even a set rule now on automatic or manual (I also think that was the case in 1998).
For reference: http://www.fortdodgetransmission.com/tech-assistance/transmission-identification-ford/