Re: Bent Rear Driveshaft
If it's high frequency, with new u joints, it's probably the u joint caused by improper pinion alignment. If your truck is lifted, it changed the pinion alignment.
My Longhorn had a vibration, especially in a right hand corner. I installed shims between the rear axle and spring and fixed that problem.
Do a search for pinion alignment. There is a ton of info out there on the subject. It's one of the most common and most overlooked sources of vibration in a vehicle.
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