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Was it just the normal driveline tention? All vehicles with a basic 4wd system generate foces between the axles when they're in 4wd and turning at the same time. This tension is reseased by the wheels slipping, which often feels like the truck poping and eveng almost hopping at each wheel that slips if the level of traction is high enough. But these genenerally have very specific feel and sound. I'd have the dealer let you test drive a different truck in 4wd to see if the sounds are similar. Just put another truck in 4wd and do a U turn on asphalt, you'll hear what I mean. Better yet, have them show you this if they say the sounds are totally normal. Make 'em prove it to you by showing you in a different truck.
Good luck.
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