I'm pretty sure it will work. I just got a 94 GT that has a serious speedo problem where it maxxes itself out when I'm traveling in 5th gear at 2k rpm.
I went to check the speed sensor and decided to de-code the tag on the transmission. Its a T5 from a 99 3.8
I don't know enough to tell you which bell housing I am using, or if the input shaft was changed/adapted, but I can tell you that it is in there and it works. The previous owner was not the smartest peanut in the turd, evident by seeing other shoddy work all over the car, so if it was difficult to do, then I don't think he would have succeeded.
Not to hi-jack your thread here, but if anyone has any ideas on how to fix the speedo problem, I'm all ears. It would probably benefit you too if you end up doing this swap.