...Toyota 4 runner? have a 1997 4 runner...... grinding noise in rear wheel. told it was a possible problem with the bearings being worn. said it was dangerous. said it could possibly be the inner or outer bearings but if inner, am I looking at a $400 bill here ? Anyone know of these things ? by the way, my mechanic is actually honest, so I know , or FEEL like the number he gives me will be fair, but I just have no idea what to expect. anyone ???