Bad differential??

The switch for the power divider is out and I haven't used it for months. Could it somehow engage on its own??

 

I'll check the strut arms but I think the snap was the center pin breaking. I could be wrong.

 

Ugg please don't remind me. That's why I think having Peterbilt check ride height is a good idea.
Multiple drive shafts
1 new rear end
New transmission
And a constant growling noise from the transmission I believe. That did not improve with new tranny. Overall it has improved and I hear it mostly when the angle of truck changes like going up or down hill, which leads me back to ride height.

 

So I just called the dealership. Next Tuesday they are going to check the ride height for me.
I've got the low leaf suspension. The thing about the air was that they run the air out completely then let it refill , make an adjustment, run the air out again and refill. My mechanic never ran the air out after adjusting. I just learned from the service guy that if you have a double frame, which I do, that changes where you measure to. I'm not even sure my garage floor is level. Too many variables, I'll second guess myself for sure. Plus it needs a new leveling valve, mines been leaking off and on.