The T-56 magnum and TR-6060 both use an electronic lockout, which wasn't used in the 05-10 Mustang GT's (only in the GT500). When I did my 6060 swap I bought a reverse lockout control module kit, but found with the shifter I have the effort wasn't too bad so I never installed it.
I bought the kit from Summit...it's from American Powertrain. Part #AWR-ELUN-10013. If you need one I would sell you mine...it's still new in the box and came with wiring instructions. Paid $124, would take $100 plus shipping. Let me know if you are interested.