No, it's not possible. I can't tell you how many times this has come up. Xbox is too weak, just get a job buy a decent PC and you should be good to go for mods.
Job- I'm fifteen, trying to get one
Decent PC- Have one, but always have trouble with patches, installing, and all that jazz.
Thanks everyone for answering, but I'm getting mixed answers. I think that the Xbox can do more than alot of people give it credit for, but that's not even what I'm asking. I'm asking if it can be transfered from PC to 360. Yes? No?