Trany mount replacement causing vibrations.
I'm constantly suprised when people run out and replace their stock rubber tranny mount and engine mounts with Poly versions and then complain about the vibration - what did you think would happen?
Most of the time the poly mounts aren't even needed - they just install because others are doing it. I still have the stock ORIGINAL factory tranny/motor mounts in my TA with the HP/TQ in my sig and no problems - no vibration either.
Less deflection=more vibration/noise imparted thru out car
You can't have a stiffer handling car and expect it to ride like a caddy...
Same thing goes for those that complain about noise/vibration after installing the Spohn Tq Arm that utilizes a lever style poly front mount vs the sliding rubber bushing stock front mount.
There is always a trade-off somewhere when installing performance parts. That is why factory uses rubber instead of poly - because the normal buyer would complain about noise/vibration and report that the car is a POS







