You’ll have to use a 98 specific ecu. You can use the stock one and have the auto functions turned off if someone will do that. And if you have pats, you’ll either have to turn it off or have your key programmed to the new ecu.
My fiancé is a mechanic and works with other mechanics who have also owned mustangs. I’m just trying to figure out if I need a manual computer and BCM for the year of the car or the year of the engineExpertise – It is not impossible to convert your automatic transmission into a manual one, but it can be extremely complex. It requires experience with mechanics and you will need to have the right tools on hand that goes beyond the average tool box.
Manual cars also go faster than an automatic. This can be fun, sure, but can also lead to more tickets and accidents. Manual transmissions are also a lot less complicated than automatics and are therefore less expensive to repair.