Lost my PTU last week. apparently it was failing. i had not heard any noise. It just failed while I was at a stop sign. I hit the gas to proceed and the Jeep didn't move then there was a loud clank/thud and the jeep took off. It continues to make a loud intermittent clank and deep hum. Took the dealer 6 days start to finish to diagnose, (the rear diff was destroyed - they had to replace it before they could further isolate the cause of trouble) get parts and put it back on the road. Got it back last night. So far, so good.
oh, 28K miles
2014 Jeep Cherokee LATITUDE 4X4
3.2-Liter V6 24-Valve VVT Engine
9-Speed Transmission With Jeep Active Drive II
Cold Weather Group
1st Jeep '74 J-20 that spent it's first life as a tow truck - RIP