Guys,
Im pulling my hair out here, when I’m on the highway at around 70 there is an intermittent vibration (feels like I’m hitting a rumble strip) that usually lasts for 2-3 seconds and mostly occurs going up hills. The truck seems a little jerky during normal driving as well. I have already changed all my u-joints, wheel and axle bearings, 4 new tires, recent alignment. 125k miles