Getting progressively worse driveshaft vibration?
on our 06 F350 diesel longbed extended cab in signature.. It has 80k miles on it now. Seems you "hear" a squeak with each tire rotation "it seems" when accelerating, usually when pulling a heavier trailer b/c your on the gas more and not taking off as fast.
Other than that, it is fine while rolling, as soon as you let off the throttle, it vibrates... weather in neutral, drive, and in any gear, at 40mph, 50mph, 60mph, 75mph... even with tow/haul on, it vibrates while decelerating until your back under 30ish mph.
Can we grease the driveshaft? Doesnt appear you can, are the bearings shot?