The sound frequency changes based on gear, the sound itself does not. It is also consistent with wheel speed, I was able to replicate it in all gears over the weekend, so I believe the issue is in the driver side axle now, and since I've started to hear other noises from that side.

I will probably only have the dealership look at it if the problem is not fixed by the time my car will go in for the recent airbag recall, which I assume it will.

If it does turn out to be the trans, I will be changing it myself anyway.

 

Update on the car. Finally got it fixed. I believe it was the axle nut on the driver's side. I had purchased a driver's side axle and when I went to put it on I noticed the axle nut, though not loose and spinning freely, wasnt as tight as it should have been. Tightened it down and completely fixed. Never expected that to be the problem, but it's been 3 days and havent heard it once.

 

Glad to see you got it going with a simple fix.....makes me wonder if I blew whole lotta money on my sentra....but my sentra had oem axles...never touched. Oh well

 

My friend had a slight problem while turning sort of clicking. Axles looked good so I figured it was internally bad. Turn out his driver side axle nut was also loose. It was OEM with 160k never touched, weird but true..now I know anytime u think u have an axle problem and the boots are fine, tighten them down first.

 

Who knows, man. I'm just happy it's taken care of! I also had some tran oil leak out when I swapped the pass side, so I drained it and put it some RL MT90, it shifts so much smoother!

And you're right, DJ, I never thought something THIS simple could have caused the racket it did. So always start with the simple (and free) stuff!