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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.
Yes
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.
Automatic takes 11.9 quarts Manual V6 takes 2.75 quarts Manual V8 takes 3.2 quarts
Yes, with enough money anything is possible.
Yes, it would be a lot of work, though.
It may be possible to have a shop to do it for around $250-$1200
You can add additional worksheets, and can name the sheets and colour the tabs individually.
how to change front and rear brakes on a 2003 ford mustang V-6
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.
Possible, but not worth it. You're better off selling your current car and buying one with the spec you want in it already from the beginning.