Hi All,
I have an 09 F250 Super Duty and recently, I've had an issue where if I'm turning and accelerating around a corner from a stop, I feel a grinding or friction feeling from what feele like the rear end. I've taken it in and they said they feel it but don't think I have an issue. I think I do since this is a fairly new thing.
Has anyone else had something like this?

 

I should have mentioned, this is the 4X4.

 

If it is a new noise and with a definite grinding sound, it may be time to get another opinion from another shop.
There could be several sources among which could be
Drive line u-joints
loose wheel(s)
wheel bearings
U joints can be tight but still be dry and beginning to fail, what kind of mileage is on the odometer?
Brake parts dragging
Differential lube (special lube for posi/limited slip types)
I would suggest definitely, get a second opinion from even a dealership if necessary.