HELP! Frustrated, perplexed and looking for suggestions.

[4thgen57]

You need a set of Chassis ears. they clip on the suspension, drive train or anywhere you want and are hooked to headphones in the car so you can listen to up to 6 different spots one at a time while driving. they are pricey but if you can find a local shop that has a set and would diagnose it for you.

[djfordmanjack]

 fresh air fan's to the front mid passenger side, maybe body flexes during drive and causes the fan to drag.
inner fenders and dash are prone to squeak on a 57 but only intermitting.

[rmk57]

Flexplate rubbing something?  Raise the car on jack stands and run it, see if a helper can narrow it down. And I don't recommend having someone lay underneath it while performing this.

Randy

[BBoswell]

These are all great suggestions. We may have found the problem, or a majority of the problem, this afternoon. A friend suggested it might be the vacuum modulator on the transmission. Sounded far fetched to me but it was only $12 and I'm grasping at straws at this point so we changed it. I drove it some 50 miles this afternoon and the horrible noise appears to be gone. There is a faint whistle noise on acceleration but that could a vacuum line that we missed when we put new vacuum lines on it. I'll know more once we get another sunny day and I can go for a longer drive. Thanks to everyone for all the suggestions.