Hi guys, on my most recent trip to the Sierra's my jeep developed an odd vibration once its up to speed, the weird part is that it doesn't happen if im accelerating or decelerating it only happens when i try to keep the same speed. i had my tires balanced today and its still happening i also checked the u joints and none need replacing. It feels very much drive-line related but im not sure what it would be. Anybody have the same issue? Any Ideas?