so ive been trying to narrow my problem down and seems like its the input shaft bearing. i get this really bad clunking/chattering noise from the trans area when im driving. well at fitst its not noticeable but after an hour of driving it gets really bad to the point i cant take off from a stop or reverse. ive changed all mounts all around with competition mounts from mazdatrix. and drive shaft cause my u-joints were just bad. so if someone can help me out you will be rewarded in your next life i promise!

 

I got this too,and I am about to check the Main Mount that comes down the center of the trans mount..that PIN.
The bushing is a little flimsy and the on;y way you can check it is to take the nut off.
If you can grasp this description of it..It looks like a CUT PIE on the inside with the pin directly in the middle.
Those "cuts" are actually rubber,so if they are worn the trans pin just flops..and makes noise.

PS: Post your Car series when you ask for Info.It makes the replies flow faster!(thread up top of this section with more info)

 

ive replaced the crossmember and tranny mounts. that one of the first things i did. if that's what your talking about. and oh nice! i new i was forgetting something. its a second generation rx7 by the way.

 

I too have some weird noise coming from the trans. Lt me know if you resolve this!