It'll bolt right up. You will need a 99-01 unit tho. And a new shifter. Not sure if there is a different crossmember/mount setup for the 99-01 T45 vs the 01-04 3650.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.