Q: Strong vibration in the rear end

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I have a strong vibration, like hitting potholes, in the rear end of my truck. When under light acceleration between 40 and 50 mph but hard acceleration is fine. Also I can hear a loud squeak when I'm backIng up. I've been told my u joints need to be replaced but I'm trying to get other opinions.

My car has 128000 miles.
My car has an automatic transmission.

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