Rear diff noise--pumpkin pulled--gears look great

I knew when I bought the '09 TRD OR it has rear end noise. Noisy from 1 to 80 and doesn't matter on or off throttle. I booked a ECGS 3rd and yanked mine today (Thanks Monkey Proof) but (I'm no expert) the gears look great; even "wear" (look barely broke in) etc.

I'll call ECGS tomorrow and ask if they do a diagnose and fix or just toss everything and start over as matter of course.

I'm asking for experienced input, I just don't want to waste time & money.

Thanks

 

So I'm kinda ham fisted some times and as I was rolling the pumpkin around on the floor inspectionacating it I broke the E Locker sensor. At least that's what I think the little fraginista is.

Does anyone know the part# ?

My Search has come up with PNC8422D which in turn yields nothing. Search for 84222d brings up this

Since the diagram in the ad shows this as installing horizontally I'm not convinced this is it since the part I broke screws into the top of the diff.

 

Did you ever find out what the noise was? Mine has the same issue.