Clunk from front end
 

I have a loud clunk noise coming from somewhere in the front end of my Bravada. It happens only during acceleration. Sounds like from the front driveshaft or transfer case, somewhere on driver's side. I replaced all U-joints, Front driveshaft CV Joint, and motor mounts. None of that seemed to make any difference. I really need some help and opinions here because I have no idea what it could be, I'm hoping it's not the transfer case or front differential but I'm really starting to think that!

97 Olds bravada