I own a 2006 Jeep Commander Limited 5.7 QT2. Mileage: 75,000. It shudders and growls in the rear end when turning the steering wheel left or right at cold start ups or after sitting for a few hours. I changed the TCase Lubricant (Mopar NV247 TCase Lubricant). Drove it down the road a few times, and figure 8's in my yard. The shudder/growl went away, but still after sitting a few hours, the shudder/growl started again. What can cause this? I will be changing the TCase Lubricant again today and the change the Diff. Fluids today as well.