Ok I have an oppurtunity to get a hold of a 87 Mustang GT with a blown motor has over 200,000 miles. It will be given to me. So I will pay NOTHING! Question is... How hard is it to put a 4.6 in this car. I am replacing the motor out of my 1997 Mustang GT with a full built one... So I will have a motor that runs good. Will my 4r70w fit right under there and what will I have to do driveshaft wise? Or would it be easier to go with a 5 speed and different bellhousing... So the thing is the 1987 Mustang GT is an automatic with a blown engine and my 1997 Mustang GT is getting all replaced and switched to a 5 speed... Will my k member fit under the 87 too? ANy help highly appreciated. I guess I will need another wiring harness and ecu too?