I have 70k miles and just recently began hearing a grinding sound while coasting. It seems to be happening the worst in 3rd gear as it drops from 2500 to 1700 rpm. I jacked it up and tried shaking the wheels to see if it was a wheel bearing but they seemed solid. I've been told it could be synchro related or some other kind of tranny issue. I replaced the rotors and brakes 1000 miles ago and they seem to be wearing fine. Please help me figure this out. This car has been a nightmare. Replaced the waterpump twice, thermostat, valve cover, and the clear coat is pealing off the wheels.