I was wondering if any of you have had a rumble type of noise in your rear end when you are turning at low speeds almost to a stop. both in forward and reverse? Could it be the clutch pack in my rear end? How about any recomendations on fluid change. What type? Any info would be greatly appreciated. I have 13000 plus on her and the rear end fluid has never been changed. or any special additives to help?

 

Do you have a limited slip in the rear axle? If so, it's probably time for a fluid change.

If it's just an open differential, then noises are a bad thing here and you should open it up and take a look for pieces.

 

Add some friction modifier.