1999 ML430 Original owner.... original transmission. Fluid replacement at 100,000 and 200,000 miles.

Today returning from errands, ML sounded 'different' and I actually thought one of the tires was about to go flat. After visually checking tires, I knew it was a more serious problem. ML in neutral and park makes a distinct growling noise which I suspect is the transmission. Noise goes away in reverse and drive.

I'm scared to drive it and do further damage , so I'll make some phone calls tomorrow to some local shops here in the Atlanta area. Probably have it flat-bedded to the shop I choose.

Couple of questions :

Do these symptoms sound familiar ? One posting mentioned the transfer case bearings.

Can anyone recommend a GOOD source for a rebuilt transmission for my ML?
I am considering this outfit from E-Bay.......seems like a damn good price as opposed to a new factory unit.

http://cgi.ebay.com/ebaymotors/Mercedes-ML320-ML430-ML500-AWD-Transmission_W0QQcmdZViewItemQQcategoryZ33727QQihZ006QQitemZ160013052852QQrdZ1QQsspagenameZWDVW

Anyone got an idea of what standard labor would be to replace the tranny?

Bottom line is....If I have to replace the transmission, it needs to be inexpensive. My ML with the high miles ain't worth a whole lot but is in GREAT condition and I LOVE IT ! Anybody had any experience with the rebuilds ?

Thanks !!