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It sounds to me like you maybe have a sticking slip-joint in the center of the driveshaft.
You step on the gas, and it almost makes a little 'clunk' noise as you take off?
There's a slip-yoke in the middle of the driveshaft, if the truck has sat for awhile, its possible the grease/lubricant dried up on the yoke and is causing it to 'stick' a little bit.
If you just picked it up, I'd take it back and let them deal with it.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.