Yes, it can be done. However, it requires a great deal of work, and will be fairly expensive if you cannot do the work yourself, and do not have a manual parts car.
You are going to have to get a new car
The automatic transmission fluid in a 2004 Ford Mustang should be changed every 30,000 miles or once a year. The manufacturer has made this recommendation available in the owner's manual as well.
It costs more than it's worth, since 2006 Mustangs still have good trade-in value and manual-transmission Mustangs are easy to unload.
You can change a manual transmission to an automatic. It can cost upwards of 3,000 dollars to do this for a Volkswagen Polo.
You can fit a manual transmission into an automatic Ford Mustang as long as you have the same engine but you will have to change a lot of things. Depending on the year, you would have to change things like the computer, wiring , steering column to add the clutch, etc. It would be better to buy one that's a 5 speed already.
A parts car like yours with an automatic transmission.
automatic transmission fluid in a pajero io
Can you change a automatic to a 5 speed Honda Accord 1990
How Do I Change My Automatic Transmission Filter?www.2carpros.com/how_to/transmission_service.htm
If your transmission is manual, you will have to change gear. If it is automatic, you won't.
You should change your automatic transmission fluid in Toyota gearbox at least after every 30,000 miles.
no The computer will loose all set codes when the battery is disconected for any amount of time usually 30sec to 5min depending on make of car