What can cause drone APART FROM exhaust?

[Mopewbie]

My 440+6 has this horrible drone, drives me mad, it goes straight into my brains!!!
It happens at lower RPM (can't say when since I don't have a tachometer) but driving around 30/40mph.

I can certainly say it's not the exhaust since I snapped mufflers, drove with open header and even replaced the headers for a hedman, drove with the new ones open and the drone was still present full on.

So.... what else can be causing this?!!!

EDIT: forgot to mention the driveshaft has been rebalanced last month and no cha ge in the drone.

Thanks.

 

[sam dupont]

OEM mufflers then?

 

[Mopewbie]

OEM mufflers then?

Drone is there with or without mufflers.

 

[MarPar]

Tire noise?

 

[71Beeper]

Or unbalanced driveshaft???

 

[hofferwood]

Turn up the radio----------------------------------------------------------------------------sorry.

 

[MarPar]

Turn up the radio----------------------------------------------------------------------------sorry.

 

[sam dupont]

Drone is there with or without mufflers.

Well, there you go

 

[Mopewbie]

Or unbalanced driveshaft???

Has been done last month, it was very far away but didn't solve the noise. (Just the shake)

 

[Mopewbie]

Well, there you go

?

 

[rickseeman]

I'm reaching for straws here. Maybe pinion angle if the drone rises with driveshaft speed. My Superbird did that. Checked it. Bought shim kit. Put it in spec. No drone.

 

[Lefty71]

Gubment drone..... those are the worst.

 

[Some Car Guy]

Running a blocked heat riser?

 

[1 Wild R/T]

Yup, pinion angle.. Watch the video, pay attention to the noise/rhythm at around 1:10 that is a signature of a pinion angle problem...

 

[Kern Dog]

I've seen videos like that before and they are quite interesting to me.
In 2003, I used a chain to pull out a post in my front yard. I had the chain wrapped around the axle of my 1984 Chevy truck. The drive to work the next day was weird. I had a strange rumble and hum in the truck the whole time. It took me a couple days to discover that the welds on the spring pads on the axle had peeled up. The pinion angle was WAY out of whack. I fixed it and had new U joints pressed in since I figured they were going to fail as a result.

 

[WileE]

Could also be ring & pinion.

 

[kiwigtx]

Change your gear ratio.

 

[Black_Sheep]

Wheel bearing? A failing bearing can be noisy depending upon how far gone it is…

 

[33 IMP]

Does it drone while NOT moving?

 

[Mopewbie]

Running a blocked heat riser?

Now that you mentioned... i don't think there's a heat riser.