I was told by the tech they were surprised that the 2015 trucks got this new transfer case. My understanding is that it is also a clutch system. They think the vibration may be the way the clutches are engaging, and it could be as simple as a software fix to stop the issue. I hope so. I do like the features of the Lariat, and I like the truck, just not the issues. This could be Ford's way of ironing out the bugs before the mighty new Raptor hits the streets. I am a Ford fan and think they will get this fixed.
The shock problem on the Lariat is perplexing, although many people who buy 4X4 trucks change out the shocks and other components. I do think Ford should have done more testing before calling the FX4 package an upgrade as the Ranchos just aren't safe on dirt roads (I had the dealer put the new KO2s on the truck before delivery as the Raptor runs the KO1s). My plan is to throw some monotube FOX shocks on the rear of the Lariat to see if that helps the stability issues. I hope so, my wife is not a happy camper.