When I first got my VX it had 912s and was already cranked. The cvs were noisy and I chocked it up to the fact that the inner boots were ripped and I figured that the bearings were toast. After putting on new EMPIs I also had a lot of noise(vibration and chatter on decel and popping in 4lo) coming from the CVs. After some investigating I found that the previous owner had cranked the t-bars as far as possible so that the vehicle was riding on the bottom bumpstops most of the time and the front was actually over an inch higher than the rear.

I let them down to bring it back to just a little bit stinkbugged and all the noises went away. I think that the extreme angle of the halfshafts with the torsion bars cranked too far is beyond the capabilities of the cv joint. Anyways it's something to look into that was simple and cheap. Good luck.