I had the same exact problem on my gsr tranny. It could be the front input shaft bearing thats going out, if that doesnt fix it then the gears might be fucked up. I replaced the bearing in my tranny and it was still making noise. Then we found out the gears were out so I had to replace the whole transmission. I would just get a good used cheap tranny unless you can do it yourself.

Hope this helps you and good luck