So can the 4R70/4R75. Unless you need over 900hp I'd just go with one of those built by Silverfox or someone like that. Or if you need more you can go with an AOD since you'll be needing a scattershield anyway at that power level and its easy for a builder to modify the AOD to fit the 4.6L.
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 ****.