my 01 f350 7.3 has weird noise in between 25-45mph but not in idle

[Eco Taxi]

Hello
I have a 2001 F350 7.3L Turbo
I have 131,118 miles
Truck is stock
Recently I have replaced ....
upper and lower ball joints both sides
both batteries
alternator
fuel filter
oil and oil filter
idle validation sensor/gas pedal assembly

this took care of my problems up until today
I noticed a weird sound when driving and specifically only hear it above 25 mph and below 45mph
I have put the vehicle into neutral when going say 35mph and the noise is still there ... the noise is a howling sound ... not super loud but loud enough that its alarming
I dont have this problem when i start my truck and simply let it idle

i have checked my oil - its fine as well as all other coolant levels
i recently have greased the whole front end and added rear end grease
the brakes are fine as well

The only thing i thought of was the HPOP which last time i had a scanner on the truck no codes came up (i dont have a scanner and had to have a local shop scan it for me)
also im not sure if it would be a water pump issue

Something I'm not sure if it is related but on the air compressor - is it normal for the plate on the outside to engage then disengage then re-engage and disengage (and so forth) and everytime it either engages or disengages there is a clicking noise that i assume tells it to engage

im not sure how that would relate to the noise im hearing


this is my first diesel so im on a learning curve but i love my powerstroke
Thanks

[Eco Taxi]

additional items to note
i figured out why that plate engages and disengages so that is solved but it doesnt make a difference to the howling sound i have
its a metallic sound
its also very random
today on the way to work nothing then to a different location for work i heard it alot and thats when i put it in neutral and was coasting at like 35 and still heard it
then i made two additional trips around two and nothing

[timmyboy76]

any update? been fighting a howling sound, ever since i popped the turbo...that was 2yrs ago..

[Eco Taxi]

My problem was the carrier bearing