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Weird sound in 3rd, 4th..

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When I go about 25-30 mph I shift into 3rd gear, I hear this kind of grinding noise from tailpipe (well back on truck, heard with window open).. But once I push the gas more, it goes away, then let off it comes back.. It does this in 4th too...


It usually happens about 15 minutes of driving...


Any suggestions?


I brought the truck into class to look at it and the exhaust wasn't welded on to the pipe, just had muffler clamps, my instructor welded it and we did a smoke test to make sure no more leaks, but this still happens... (it was doing th noise before this too...)



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