Edgecrusher09

I have a quick question. I recently purchased a 13 z71 with the 6.2 and 4x4. I freaking love it. But sometimes when I stomp on it it sounds like it "hiccups" between shifts, usually from either 2-3 or from 1-2. This is not a "hard" shift, its like the engine stops for a millisecond and the truck lags until shift is complete. Any ideas what this is? I only have 2800 miles and I don't want to worth about a truck so new..