How much does it cost to fix transmission on a 98 ford taurus

$3672.38

Depends on what is wrong with it. Only way to tell for sure is get estimates from several transmission shops.

Around 3 to four thousand dollars

depending on the problem as little as 20 bucks to 1500 dollars in my own personal experience if l had a 98 taurus with a tranny problem l would sell the car take the money and buy something with a little more transmission reliability like a 10 speed huffy.