the back of my blazer sounds like grinding when im moving,what would this be? sounds like grinding when my wheels are turning? thanks

Could be brakes, or possibly a rear wheel bearing, or even a universal joint. What other symptoms are there? Does it change when you apply the brakes? Does it change when you are turning a corner? Any details you can give will help with diagnosis.

it sounds the same as when i brake and gas and coast, i havent noticed a difference in turning/ havent been able to tell. thanks

Sounds like a wheel bearing to me

Could even be pinion or side bearings in the rear axle.