Tranny ?
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You've got a bad engine or tranny mount
Pretty common, the rubber isolator is either worn out or damaged, and when you're stopped at a light with the truck in gear, the vibration of the engine is translated right into the truck and it "drones" like a pager going off in vibrate mode.
Get your mounts checked, happened to my wife's 2001 Dodge caravan, it was a factory f@%$-up.
Get your mounts checked, happened to my wife's 2001 Dodge caravan, it was a factory f@%$-up.