Clutch, or Transmission issue, not certain!!!?!?!

[Twizz]

After reading some posts, I'm thinkin' maybe I have a Pilot Bearing issue? Not sure..

Well, if I put it in gear, and keep it at a slow pace and change gears, it'll go, up until 2300rpms, and then it'll start stuttering hard..in whatever gear..
Like a hard "TaTATATATA" sound, and some shaking..

This really sucks. The car idles fine, and I'm pretty sure its a transmission issue..but I guess it could be a clutch issue, but the clutch seems pretty tough still for being stock, since I dont ever drive the car hard..

Anyways, any feedback you guys can provide before I flip out and curse life, is greatly appreciated.

Cheers

- Twizz

[Cutlass]

almost sounds like an engine misfire??

[Twizz]

I was also thinking maybe it could be the rear differential, seeing as the gear engages, but it stutters when I hit the throttle a little hard..almost like its "slipping"

Crap. I'll try and figure it all out tonight when I get under it.