When driving between 30 to 40 mph. My Gladiator sounds like it has a turbo

[Heleri]

Just got back from running trails in the San Rafael Swell region in Utah and when driving the gladiator I get a strange sound like a turbo between 30 and 40 mph. I can not isolate where it is coming from. Any thoughts how/where to look to trouble shoot this??

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[Bbannongmu]

Could be a pinion - pinion bearing. Like this??

 

[Lukasz]

Do you have a cold air intake or a snorkle?

 

[Heleri]

Stock air intake, no snorkle

 

[Heleri]

does not sound like that at all, just a high pitch tone that happens between 30 and 40 mph then above or below that speed nothing..

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