Quote Originally Posted by mattyb
the centre bearing and flex disc are due at about 200k anyways. who did them and was the shaft put back on correctly? how did u check the tranny mounts and the engine mounts? if u dont lift em all the way up, especially the engine mounts u wont know. my money is on the engine mounts before heading into other complicated stuff. if the engine mounts havent been done for a while then its not going to hurt to do them. they are cheap and quick to do and then start looking for a vibration if there is still one.
You beat me to it. I definetly agree with mattyb. My car only has 58k and I just replaced the guibo and center bearing. Even if you recently replaced the guibo CHECK IT AGAIN. I replaced mine in July of 05 and by November of 05 it was ripped to ****. I think the problem was (1) the guibo was a cheap Malaysian part and was a POS or (2) the center bearing was so bad that it managed to shred the guibo to pieces again. I had the same kind of vibrations that went away after a certain RPM was achieved. It doesn't seem likely that it's the guibo or center bearing, because I originally thought it was the engine or trans. mounts also. Hope this helps you out a little.
-Andrew