Help me understand what my trucks telling me

Diagnosing a noise I hear and I can't make sense of what it might be.

background: I replaced the pinion bearings, carrier bearings, and wheel bearings in my rear differential. 2016 Ram 1500, Chrysler 9.25 rear end, non lsd

Symptoms:

1) Rotational noise heard coasting at 30mph or less. Can't hear above that due to exhaust

2) Noise happens when cold. After driving for an hour or so the noise goes away

3) Noise also goes away whenI brake hard 30mph or lower, but comes right back when driving/coasting

I checked rear differential fluid level and topped it up. Also used mfg recommended 75w140 Amsoil. 
 

The most confusing thing to me is that it goes away when the truck is warm and has been driving for a long time. Makes me think maybe the fluid is too thick? Or it's a brake issue that goes away when the brakes are hot?

front wheel bearing?

incorrect diff fluid / friction modifier for the rear end?

disc brake pad dragging?  

Did you check the U-joints?

Front wheel bearing

Is your truck old enough to have a non electric parking brake? I would try applying the parking brake slightly and see of the noise still goes away while braking using only the rears. Might help pinpoint if it is actually the front that's the problem. 

I assume you set pinion depth and backlash of the ring and pinion.

Auto or manual transmission?  Can you push in the clutch / shift to neutral at different speeds to see if the noise changes?

Same shims same side?  Sounds like a backlash issue.  Does it change when turning left or right?  If it goes away/gets worse when you are in a turn, or if it changes under accel/coast, it's most likely a backlash/shim issue.

If brake use affects it but turning doesn't I would be looking at brakes. Caliper sliding action, wear of pads, even temp of each corner after 15 minutes of driving.  Just be glad it goes away!

I think it's telling you to get a new truck, and maybe a racecar