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This has been covered already.

'14s were recalled a while back now it is carrying over to '15 models.



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      I sell, fabricate, deliver, install and train workers how to use my packaging lines.  In 2015 selected 2500HD WT 6.0 as the platform to use as my office (Truck Camper) and and tow vehicle.  It provided great HD service and economical (per mile basis).  On a trip to OR noted a resonance with my thumb on the steering wheel, when engine load changed going over an overpass.  At first I thought it was roadway groves, but the rhythmic vibration stopped when manually dropping into a lower gear, increasing to 3000 RPM's. 
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