Humming noise coming from rear.

A good tip there. Time to flush that diff. Might be worth while buying one of those magnetic drain plugs for the diff so when you flush it you grab the suspended fragments. I have seen a couple in the for sale section.

 

Just going to throw this out there.
Humming noise from rear

Fuel pump and FPCU on the way out

Might be worth investigating and a lot cheaper than a trans rebuild

 

Dif oil has been changed, still the issue persists.

I am currently having the transmission rebuilt. This will hopefully resolve the issue

 

So FC are you getting any upgrades, like Kevlar belts??? I read that is a thing, in a post by one of the big power members on this forum.