Where did you get the Maya files, and what did you use to import the .gr2 files, etc.? If you provide more details, it might be helpful, and we might be able to figure out the problem.
.gr2 I obtained using a similar method as in one of my previous posts. I imported it into 3DS MAX using an import plugin. But then you need to create a rig because the skeleton is empty, and it's practically impossible to animate it because of that.
I'm a novice in all of this and don't know much.