Driveline Vibration

[TITAN STANG]

I have a 90 Mustang LX 5.0 with Manual transmission. Currently it has a very noticeable vibration that becomes very bad on 5th gear at about 2000 RPMs. it does not happen when I brake. I don't know what the hell can be causing this. I replaced the U-Joints, but it does not change a thing. What could it be?

 

[King of Cobras]

Read this hope it helps
Vibration

 

[90bluegt]

I needed to get a Aluminum DS because i was have the same issue. I just bought it, haven't put it in yet. But i had the U-joints replaced and that fixed it a little. Not quite so much vibration. That could certainly be an issue..