another type of noise...

I have a 91 Acura Legend which I adore & had planned to hang on to for a while, but recently there's been a weird sound eminating from somewhere behind the engine, whenever the car is running. It's really noticable inside the vehicle with the door closed. The best description I can provide is that it sounds like "washing machine agitation."

My mechanics are great guys, and specialize on Hondas & Acuras, but cannot figure this one out. They spent a couple of hours on it today and suspect that it's the transmission bearings, but advise that i should get a second opinion. I plan to go to a specialist within the next day or so.

I thought these trannys were built really well. Currently, there is no slippage between gears. I don't know if it's a coincidence, but the rear mount was replaced last fall. The car has 150,000 miles and if it takes $3000 for a rebuilt unit, I should probably let go of it, right?

Any ideas or advice is welcome.

regards, gpeterson