Posted: Nov 12 2015 at 9:58am | IP Logged

akbryant wrote: My 03 Frontier has vibration that starts at 60 mph. New tires and properly balanced wheels ruled out. Mileage is 96,000... Any suggestions as to cause?

AK,

Check the Driveshaft universal joint's.  When they balanced the Wheel's,, did they check the Wheel's for warp.  Wheel's can get warp'd over time, from several different thing's;  Pot Hole's, Curb's, and even not torqing the Wheel's correctly.

If your truck has the Center Bearing, that connect's the 2 driveshaft's, that can also cause a problem.

Also while you are under there, check the Rear Axle Oil Level, and the Axle Houseing Vent, to make sure the level is correct and the Vent is free flowing.

If the Universal Joint's have any play in them,, then that's probably the problem.

HTH/Good Luck