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MN12s have a mass damper which attaches near the tailstock on the 4R70W. I left it off the last time I put the trans back in the car, because it weighs about 5 lbs, and because I've changed trans mount bushings, driveshaft, and other parts which affect system stiffness so I figured it was no longer functioning to design intent. I do have a driveline vibration at about 120 mph, but that has been there since before removing the mass damper. Are there likely to be any bad consequences from leaving this part off?
 

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WOT Junkie and avid corn burner
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3,734 Posts
When RobertP and I dropped my transmission for the torque converter install, we took mine off. It felt like the weight was full of sand or something. I have not noticed a difference in NVH. Then again, I can't feel anything else over my craptastically balanced MKVIII drive shaft.
 
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