I just wanted to add in that my Ford Probe didn't do it (the vibration) all the time either. If you'd haul butt and to like 85 or so miles and hour for a while, the bad vibration and heat from that would expand the joints, and they would tighten up! And it would be fine (no vibration) for a while until you exited the freeway to get gasoline or something, and then when you got back on, they would vibrate all over again. Hope this helps.
'95 CONTOUR SE
-Enkei 16s
-Porsche944 Exhaust tip
-
Audi xenon projector headlights
-Peterbilt 30" air horns
-mp3 Aiwa headunit (150 songs on one disc)
-dual 10s
-soon to have LED tailights (real kind, not just gay bulbs)
-That's it for now