Posted by Steve@Advance on April 02, 2018 at 08:20:39 from (24.182.105.179):
Boss just had me go bring his truck in, 09 F350 Super Duty 4x4 diesel.
It started making a slight vibration last week, but I never got a chance to look at it.
This morning coming in it got drastically worse, so he left it on the side of the road. We went and got it, sure enough, horrible, violent mechanical vibration at drive line speed.
I looked the U joints over, didn't see anything wrong, jacked the rear wheels up, ran it at various speeds, NOTHING... Tried loading it with the brake, nothing.
It is in rear wheel drive, so nothing forward is turning. Lock out hubs are disengaged.
The vibration is not effected by throttle or coasting, anytime rolling over about 10 mph and up it vibrates, over 30 is scary.
I've looked at the tires, felt the bearings, nothing loose or heating up. Vibration too fast for wheel speed.
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