Can I put a v8 engine from any year 1999 to 2005 Ford Mustang into a 2002 Ford Mustang I have that has a v6 3.8 engine in it
Youwill have a lot to change before it will run
Correct, you can do it, are you prepared for the cost and work involved? If you don't work on cars, then you will be paying someone else to do it. It's more than an engine. Transmission, wiring harness, computer, bigger brakes, etc. You will have more $$$$ into the conversion than a V8 car and never recoup your $$$. Your best bet is to sell the V6 and purchase a V8 with a manual trans.
Search Ford Mustang Questions
Ford Mustang Experts
Related Models For Sale