i found something like that on my 84 rear end, i took it off, drove down the highway, put it back on drove down the highway then took it off again and drove for a few days to try to figure out what it did, the most i can tell it stops humming sounds and slight vibrations, making it feel like a much better built car. one could probably deduce that from the title of the thing though "vibration dampener"
imho, Leave it on. It reduces driveline vibrations. Unless your building a race car that needs ever ounce of weight off of it, it will do nothing but help...
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