I never expect a clear view from mirrors while moving - wind and vibrations move the side view ones, and the windshield frame moves a lot from wind and vibration for the center rear view mirror to give a clear view. They are clear enough to know if there is someone there or not, and you should be looking back anyways to make sure there is nobody in your blind spots. If you are trying to read license plates or check out something in detail behind you, forget it. You shouldn't be that focused on items behind you anyways.
And yes, poly mounts (engine, body, trans, etc) do transmit more vibes than rubber does. That is why I use rubber mounts. If I wanted to drive a vibrating rattle trap, I'd drive my Ranger with poly motor mounts and no body mounts - the body sits on the frame nowadays from rust taking the mounts out....
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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