grinding from rear wheels

Hello, I would be checking, in this order: 1) Tire condition. Abnormal tire wear can cause a noise. 2) Rear brake system concerns. A dragging pad or shoe or hardware against a rotor or drum can make noise. 3) Wheel bearing noise 4) Rear pinion or differential noise. Hands on inspection is needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops