Transmission line on 2001 Pontiac Grand Am

My daughter was told that she needs a new transmission line since there is an oil leak. She has an appointment for today 5th and would appreciate an answer as quickly as possible. What would the cost estimate be for something like that?

Asked by for the 2001 Pontiac Grand Am
Did you have to replace your transmission because of an oil leak? If so, where was the leak coming from?