rear differential disengage ping?

I have this mini off-road trail down the street from my place

Sometimes I turn on the rear locker just to run...

today, when it disengaged, it made this ping noise, so I locked it again and un-locked it and it pinged again...

it never made that noise before... ideas?!

 

The only thing I can think of is the rear end punched the driveline enough to hit resonance with the driveshaft. I get a ping in my driveshaft when i shift into gear all the time. I think it actually sounds kinda cool.

 

sure no one else was invited to the trail run......
post this in the garage and someone will answer

 

there's nothing wrong man. It's normal. I'm sure it has been making that noise, and now is the first time you've noticed.

Can someone confirm or deny?

 

I'm not too cool about this ping noise... it sounded like I broke something...

 

mine do not make any noise.....

 

did you ever get this answered? I tested mine out today and it made a ping although
i tried engaging it in drive rather than neutral(noob). When shifting from drive to neutral it made a ping

 

nah, i never got the response, but I think is the gears trying to disengaging and it made the noise, i haven't tried to lock the rear locker in awhile, too busy with other BS