Noises happen mostly upon acceleration, but not every time & sometimes it's louder than others. noises aren't coming from the motor. the exhaust seems tight, although noise kinda resembles loose ehaust. truck is a 4 door & the noises sound like they're coming from the area under the back seat. also twice now at 55 mph i felt a vibration, not the kind that you get from bad or unbalanced tires, more like a whole truck vibration.
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did u inspect universial joints ?
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