It was free at least...

I had a friend who was cleaning out a garage full of Ford parts. In a box is a used trans from a newer Ford. I don't know anything about it except it will not mate up to a 302/5l motor. The tag reads XR3R-7003-AA. Any help would be celebrated on my part with a swig of beer in honor of the person providing said info.

your answer here:

http://www.mustangforums.com/forum/4-6-modular-mustang/377691-which-transmission-do-i-have.html

for a modular 4.6

Thank you, I found the part number at Tremec, it is a T-45. I will now drink a beer in your honor!

Ooooh! I'll give you $10 for it!