1999 Ford Mustang Converting manual to automatic

This is not an easy swap as the computer wont see the trans to shift it. You more or less are better off with a donor car so you can everything needed. If you stay with a current style Mustang you will need to flash the computer to see an automatic, you will need a tcm (transmission control module) and then there is possible driveline difference length then shifter change. Now if you go with an older AOD that doesn't require a computer flash and such then you just need to deal with a shifter and driveline and u-joint at the trans. Also most of these model Mustangs have different gears for auto verses manual so you may loose a lot of take off power. If you don't mind me asking why change it. My 98 has a 5 spd and that is what makes it more fun to drive (just my opinion however).

Honda's are usually more complex on doing this. Like I said though if you find an older AOD that is not electrically controlled then that would work but it is some work to do however.