Wicked vibration between 55 and 60 in a 1989 dodge omni

me and my father share and drive a 1989 dodge omni and when we drive between 55 and 60 mph there is a wicked vibration. we cant figure out what it is. we’ve had the axles replaced along with the brakes but the vibration is still there. Help?!

Is the vibration being transmitted through the steering, the whole body or one area of the car ?