They may be referring to it being as a "zf" transmission, which is indeed a stump puller. If that's what you have, sell it to a bronco/f150 guy, that's NOT what you want, your mustang will drive like a dumptruck, and that's even if you can figure out how to mount it in your stang.
the other trans used in f150's/bronco's are the m50d, a mazda 5 speed, still not what you want. Move on, sell the parts to truck people imo. fyi, the engine too, is a non ho engine, likely flat tappet.