i have installed the urethane drive shaft carrier and diff bushings. i have also since installed the Torque solutions billet rear bushing. since rear bushing the diff whines louder at highway speed. i know why this is, my question is this.. would putting sound deadning material under back seats and in trunk bottom lessen the whine i hear in cabin. i have experience with it for audio performance but not for this particular. if i have to will go back to oem bushing to get rid of whine.

 

Tough to say without hearing the noise directly. I did notice a slight drop in exhaust noise after dynamatting the trunk. If you're really trying to keep the noise from coming in (vs. keeping sound in the car and vibration damping) I would try a layer of dynamat covered with their dyna pad.

 

thanks

 

... about the same as laying down a very dense blanket.