Probably parts of your driveline are just in need of some lubrication. If you do some Google searching for drive shaft or slip yoke bump, you'll find that to be a very common problem with all trucks. My last two Chevy trucks, my parents Toyota Tundra, my neighbors Nissan Titan, and several of my company's trucks have had similar problems. They needed everything from simple lubricating to replacing parts of the driveline to fix the problem.
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