Don't know if the following makes you feel any better, but:
I just installed a new Roamerdrive a few months ago, and I was surprised at how little noise the unit made from the beginning. Before test-driving my '71 S2a, I filled the unit with Redline MTL manual transmission fluid, and have yet to hear a peep out of the unit. Now, it does generate a very light whine (even when un-engaged), but the sound is very slight, and now I'm not sure whether it can be heard with or without my foot on the accelerator...? Not sure. When the unit is engaged though (almost daily), I can hear no difference in volume of the extremely faint whine. But - I'm also running those Michelin 750 x 16 knobby military tires (also sold by our host), so the tires sing quite loudly when I'm driving down the road. Those particular Michelins are loud!
BOTTOM LINE: I'm convinced the unit should NOT make any loud metallic whines - even when newly installed. I'm also sure that Rex Young, the production manager for Roamerdrive, would be able to resolve any questions you might have about unexpected noises.
AGAIN: My new Roamerdrive is very quiet. I almost expected more noise, but just don't hear much from the unit at any speeds. I use it in second, third, and fourth - and more often in third when I have a bridge to climb here in Florida!
David
Daily Driver:
1971 Series 2a, 88, Soft-top, LHD