It's been 2 weeks, noise gar gar.....coming from below. First though it was coming from that lousy tyres installed 4mths ago. Then slowly realised once 4th gear kicked-in the noise started to roar until the car slowed till 2nd gear speed then will the noise stopped. And btw its an old AWD 4 speed AT car. Checked GB fuild and it's full n clear in color, did an AT flush this Feb, for now only can't check the rear diff gear oil lvl. Going w/s tomolo, but if its the rear diff dry up, will the noise start in 4th gear? This stupid noise is like the gear grinding each other non-stop. Anyone experience this issue before?