I getting this motor noise from the rear of my truck! Any ideas on what that could be?

 

DI or DII? Need more info. Electric motor noise? Mechanical noise?

 

could be the muffler leaking?, or maybe something to do with the axles.

 

it's a disco 1 with 133,000 miles. It sounds more like a electric motor.

 

Thats your fuel pump, haven't you noticed it before?
If new and louder when hot out, the pump is probably starting to fail.
Have you replaced your fuel filter to make sure the pump is not pumping against a plugged filter?

 

I notice it before when its hot. I will change the filter and see how it does.