When going 60-70 on the highway, have a vibration in the vehicle.Anybody have this problem? Worked on Hondas for 20 years and when this happened to Hondas, it was most likely the CV joint...any ideas on what to check on the Disco?

 

Have you checked the obvious tire balance and air pressure?
Next thing I would check is the front drive shaft, the constant velocity joints are known to fail because they came from the factory without grease fittings. If your don't have grease fittings have new u-jonts installed.
Mike