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I would suspect a loose baffle in the exhaust system. Once I put an overhead rack on my F250 and when going down the road at a certain speed the air rushing between the overhead bar and the truck cab caused low hum.
When the noise starts ,and it is safe, put the transmission in N and see if it goes away. I have also shut my engine off while driving to see if a noise goes away. Usually it is a vibration problem.
sounds like a vacuum leak from a mad gasket
as the engine warms up the gap increases allowing the noise
on acceleration the vacuum is very low so the noise is not heard
check for hoses that are cracked , loose or fallen off
most likely if its a hum it could be tires , if its a roar it could be the drive train
support the vehicle on jack stands , start the engine , put in drive and let it idle, if noise is gone ...its the tires if not check the drive train ...start with fluid levels
Ring and pinion noise for sure,yes. Check for play right at the yoke where the drive shaft goes in.
I've seen a few fords where the pinion nut was loose and after re torquing they lasted another 100,000
engine start and stop again while remove the foot from accelerator
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