My wife has a 2012 that just turned 120k on it and it's time to do a full service on it. Doing some research on the service and I found it uses a PTU, not a transfer case. There's a nice write up I found on how to change the fluid. My question is there also a front differential also that need changed out? I'm planning on doing the transmission filter/fluid, differential and PTU all at the same time.