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I've noticed a vibration in 6th gear on the highway in my '02 HO CTD. If I am gradually accelerating, the vibration begins at 72 mph, and continues on up through 80 mph (I haven't been up much higher). But if I am on the pedal, the vibration will begin as soon as I hit 6th at around 55 mph or so. The vibration feels like it's coming from the rear half the truck (I can't feel much of it in the steering wheel, but a little shake is there). Around town at lower speeds and in 1st-5th it drives smooth. I haven't heard any noises coming from the drivetrain either. Has anyone experienced this same symptom? Or have thoughts on the source? Maybe a wearing u-joint? The tires are freshly mounted and balanced, and the truck was aligned last week. If engine RPM at these speeds would help, I can go check and reply. Thanks!!