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Hollow Noise at 55 mph


turbobob
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I'm in the midst of purchasing a 2011 Shelby with 11K miles. It is a beautiful car but I am hearing an annoying hollow sounding noise when driving between 50 and 60 mph. The noise does not vary with engine speed. Almost sounds like a deep pitched wind noise (like the sound of roof racks moving through the wind). Does anyone know what this drone might be? Could it be the tires? A Ford technician took it for a ride today and reported hearing the sound. He said that it doesn't sound normal but he admitted that he is not certified to work on the Shelby. It is still under warranty. Appreciate any help.

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Check to see if the tuned weights have been removed from the ends of the rear axle housing. Sometimes people take them off to save weight or to install mods where they tend to get in the way.

 

 

Yeah, good thinking.

 

But didn't they get rid of those on the later models? I know my 2010 HAD them but I removed them (and don't have the harmonic noise they are intended to remove).

 

 

Phill

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Thanks for the responses. Being a Shelby newbie, I have to admit that I don't know what the tuned weights are nor do I know where to look for them. The car is currently with the dealer (independent). He's going to take it to Ford to have it looked at. Despite the fact that the first technician heard the noise and seemed puzzled by it, I'm betting that Ford's Shelby specialist will say that it is a normal sound. I also noticed something that might be a normal characteristic of the vehicle but I thought I'd check with the experts here. When driving down the highway around 60 mph in traffic, when I release the accelerator to coast, then accelerate again, I feel a slight bump or bang in the drive train. Does this seem normal?

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Phil, I don't know when or if they stopped installing those weights. I took mine off to install the relocation brackets. My car doesn't make any strange sounds at all either.

 

It sounds like that car could of also had an aftermarket upper control arm installed, it sounds like he's describing that "clunk" sound they make. Also sounds like the gears were changed and it's humming like people complained about when the 3.73 swap was popular.

Edited by Secondo
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We have a 2011 with Goodyear Eagle F1 tires (stock tires from factory). I never did like the "HOLLOW" sound they made. After 17000 miles and half a dozen track days we put new Michellan Pilot Super Sport tires on. Noise gone. I don't have a clue if this is your problem but you did mention tires.

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