t45 unless someone swapped it at some point with a 3650. If its original its the t45. Or you could just look at pics of both transmissions and just crawl under the car...
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.