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I had both engine and tranny mounts from Schumacher and had vibrations transmitted through the body like crazy. Changed out the engine mounts and that helped a little then changed the tranny mount back to rubber and the vibrations pretty much went away. It has nothing to do with Schumacher really just the poly mounts in general seem to transmit vibrations more. This is also kind of hit and miss as some guys get those vibrations with poly...some dont. In my case poly was the issue. If it were me I would start with the mounts first and then move onto other things mentioned in the posts above.




I also had it happen after installing two Schumacher poly locs. Started up the car and didn't even drive it. The Steering wheel just BUZZED in my hands. Replaced the passenger side mount with stock--90% of the vibration was gone-I am happy.