How to know for sure if it's the front differential or the wheel bearings. on 2006 Mercedes-Benz R350

Grinding and vibration sound coming from the front of the car. Feel and hear it around 35mph to 60 mph.

by in Encinitas, CA on July 18, 2011
2 answers
ANSWER by on July 18, 2011
SOUNDS LIKE POSSIBLE BAD WHEEL BEARING, THE ONLY WAY TO KNOW IF IT IS DIFF OR BEARING IS TO ROAD TEST AND DIAGNOSE, I USE A CHASSIS EAR WHEN SYMPTOMS ARE NOT OBVIOUS, BUT I CAN DETERMINE FOR SURE WHICH IS DEFECTIVE. HOPE THIS INFO WAS HELPFUL, FEEL FREE TO CONTACT ME IF YOU WOULD LIKE TO HAVE YOUR VEHICLE DIAGNOSED. SINCERELY, RYAN MODE MODE AUTOMOTIVE 858-361-4645 MODEAUTOREPAIR.COM
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ANSWER by on October 25, 2012
I have the same problem as yours - grinding, vibration ( as if you are doing an engine break when you slow down). replaced mine thru dealership and paid just the labor and parts included as warranty even if I had 65000 miles already.