Hello I have a 2103 SRT8 and having a loud clicking and popping coming somewhere underneath the car. Its intermittent and goes away if shifted in neutral while moving. I have checked all the obvious things, rear dif, CV axel, wheel bearings...etc. i have done a mid muffler delete and the adaptive valves are quite worn causing squeeking and some vibration. My mechanic says that the valves are what are causing the sound but it doesnt sound like a valve issue. It sounds like a busted gear popping and clicking...but again the fact that it is intermittent is the real brain buster. If it were a gear issue in the front or rear of the driveline it would constant right?? Any help on this would be appreciated. I am quite perplexed. Thanks in advance.