Just bought used Landcruiser and I love it.
From between 45 to 70 mph I have noticed a whine come from under the
middle to the rear of the truck. Only occurs under load , very quiet under coasting condition.No vibrations at all. Is this just normal driveline/gear noise and i'm not use to it, or is it diff. bearing problem? I did drive a 97 LC to compare and it had a somewhat less whining noise at highway speed. No oil leaks, all diffs have good fluid levels. What's a quick check underneath to be sure?