Guys / gals,

What the most likely place to start looking for a vibration from my freshly rebuilt 727?

The shop is taking it back for a look-see tomorrow AM and I'm interested in the "talking points". I figure most likely a poorly balanced converter? Otherwise I figure there ain't much that gets balanced.

BACKGROUND:
Local shop, very reputable and reliable Mopar-lovers. I gave them my car with 727 for a rebuild, new converter, seals, bands, etc. They pulled the tranny, opened it up, found busted flanges in the case at the pump. I went over there and they showed me everything. So we bought a used 727 and swapped all my stuff into the unbroken case.

The 'new' tranny shifts and drives 200% better than my old one - nice and tight - except it vibrates in "waves" when accelerating - around 25mph, 45mph and not so much above that. How much does it vibrate? - Enough to make the car feel "rough".

It doesn't do it off-throttle. I feel it in my butt. Plus a little vibration in the steering wheel. I think it's the tranny and the shake is transmitted to the chassis at the mounts.

Opinions?


Thanks!
- Art