Mine was leaking grease after a seal broke on it. It didn't handle any differently, and there were no noises either. The only reason I knew it was leaking grease was because I found gobs of grease on the faux skid plate when I was adjusting the belts.
If you're absolutely sure it's the transfer gear, it's not that difficult to replace yourself.
It's a costly piece though, and you'll likely need an alignment afterwards.
I lucked out and found one in the single R50 that's at my local auto wreckers. It was from an older 96-99 Pathy and my steering now is a bit "looser", but it did the trick.