When It decelerate from approx well any speed the front and middle of the Jeep97 chasie this whining grinding draging like sound comes and goes and gets louder the faster it's going not con-st?

When It decelerate from approx well any speed the front and middle of the Jeep97 chasie this whining grinding draging like sound comes and goes and gets louder the faster it's going not con-st?
If the vehicle is a 4x4 could be the front differential. If not, possible a wheel bearing.