[carguy138]

OP I'd suggest having the rear end checked out, something doesn't add up. Might be a wheel bearing or differential bearing on the way out.

Was the driveshaft dropped during the install? If the center support bearing isn't properly loaded, it will sound exactly like what you are describing. Also if the rear differential was dropped and the driveshaft nut wasn't fully re-tightened, it could be binding.

FYI I have delrin subframe bushings and experienced no change in NVH. I did notice gear whine after I installed delrin differential bushings which became worse when I installed a rear differential brace.

When I installed the Wavetrac, I ended up removing the differential brace and am very happy with it now.