if i have a v6 motor and a 4 cyl tranny ( the v6 duratec and the 4cyl focus use the same trans) does it matter which flywheel i use?

Use the MTX-75 flywheel since that will bolt up to both the Duratec 2.5 and the 2.0 Focus tranny/engine for insurance.

so they use the same flywheel in other words? i didnt know if the one in the four banger car would be smaller and lighter or not

I’m pretty sure the MTX-75 in any car uses the same flywheel and clutch.