Catastrophic failure....I changed the gear oil, took a road trip to NC. Driving down the road about an hour out from my dads house 70-80 mph and I get vibration when i let off the gas. Didn't really pay it any attention I had been driving all night and was ready to be home. All of a sudden I lose my driveshaft and hear the worst sound I have ever heard from my truck. I get pulled over safely and check out what happened. I dont even know whereto begin on what may have happened. Driveshaft gone, where the transfer case attaches to the the transmission is completely sheared off, transfer case is laying on the crossmemeber with the rear of the transmission still attached to it, front driveshaft straps were broken. I just called my dad and he picked me up and I left it on the side of the road. Finally gonna go look today. I have no idea even where to begin, I just did my loan app on a 2014 1500 4X4, dont even want to deal w this thing anymore.