Had a '99 with 506 miles on it. Was thinking "woohoo! break-in competed" when the rear shaft rear u-joint let go at about 75mph. Boy oh boy, talk about vibration....mirrors were a blur but could see I was trailing what looked like smoke. Eased to the shoulder and shut it down, looked underneath to see tranny fluid gushing out onto ground. Rut row!! Bent drive shaft, ripped the side out of the transfer case, busted rear spring shackle, elongated the spline hole in the rear end and other things I can't remember. Dealer was a pain, instead of just looking around to see what got broke I had to go back every time I found something else...took about a year to finally get it all done.
Just rolled over 501 miles on the '17 2500 today......