I just bought this vehicle, and it never did this when I test drove it. While I was driving it made this metal screeching noise, and second or two later the noise went away and the rear of the vehicle vibrated for second or 2, and went away. When i accelerated it happened again. Luckily my house was right around the corner. I thought it would be the difference in tread. I grabbed a penny and tread on front and rear are dime thickness (or whatever the us 10 cent is called) apart.
Even if there is a small tread thickness could that still cause it?