Jeep Grand Cherokee 2013: Front end knock

I have owned a Grand Cherokee for 18 months and following one of your articles about a front-end knock I went to my dealer and the shocks were replaced without hesitation. So far, so good. But then I noticed what felt like running over a small bump when the vehicle was changing from first to second gear. After three visits to the dealer it was traced to the transfer case, which was replaced along with the tail shaft. The transfer case noise was not unlike the rumble of the shocks, and from what I understand the dealer has replaced more than mine, so be aware. I must say through all of this the dealer has excelled in hearing and acting on my concerns.