1999Z28

Well, I really don't know when it started I'll start with.

I had an energy suspension tranny mount, just swapped it with a prothane. Car has 85xxx miles on it. The engine mounts look fine, I highly beleive they're fine.

After putting a converter in it, I was "looking for it" and since taking it out and having others in and now back to a stock converter and flexplate, it's still there.

I just today put a ASP crank pulley on. didn't help.

Basically at any rpm range, the entire car will shake(in nuetral). You can bearly feel it at idle, but most noticable when rpms are dropping. While driving, mostly in 3rd gear(auto), at about 3000rpms the center console sounds like a I have two 15in subs underneath it.

I heard it's possible that a valve kissed a piston and the uneven compression could be causing it. I can get a video, but don't know how much help it will be.

Anyone else have suggestions?

89 formula350

iTrader: (8)

so you need to be moving? is so check the u-joints if not start a compression test

1999Z28

No, I said you can feel it at any rpms(in nuetral).
It's there at all rpms. Bearly felt at idle. Probably worst at 2-3000rpms.

I was told that it probably won't show up on a compression check.
Just hoping for a few other possibilites/suggestions.