Bird chirping noise

[Shed]

Hey all,

I have a 1999 Tahoe with the 5.7 and 4l60.
It started making a new noise about a week or two ago. It usually happens around 60kph or 80kph, and it sounds like a bird is chirping super loud. I'm new to owning a Tahoe so I'm unsure what common problems are, hoping a wizz on here might be able to help.

I also have a metal tinging/knocking sound when I take off sometimes. I have a small leak from the output shaft on my transmission, so I'm thinking if I replace the seal it will take it away. But I'm also worried it could be the actual transmission.

I have a video of the noises, I will try and upload them and edit the link into the thread.

EDIT: here is the bird chirping noise

And here is the metal tinging noise

Any help would be greatly appreciated!

 

[iamdub]

Sounds like it could be a loose or broken heat shield, broken catalyst in the converter, loose flex plate bolt(s), or cracked flex plate.

 

[Shed]

Sounds like it could be a loose or broken heat shield, broken catalyst in the converter, loose flex plate bolt(s), or cracked flex plate.

you're referring to the metal noise? I will check out those parts. It only makes the noise under load aswell

 

[iamdub]

you're referring to the metal noise? I will check out those parts. It only makes the noise under load aswell

I didn't hear the "bird chirping" noise in the first video. What I head sounded more like a tin metal scraping/rattling sound.

Could also be dry and worn U-joints, unless it does it when sitting still.

 

[Shed]

I didn't hear the "bird chirping" noise in the first video. What I head sounded more like a tin metal scraping/rattling sound.

Could also be dry and worn U-joints, unless it does it when sitting still.

okay gotcha. I will try and get a better video of the chirping noise. Its quite loud in person but the wind muffled it a bit

 

[bigfootchiro]

Flex plate or heat shield in my opinion. I’d say more flex plate

 

[Shed]

I'm going to my buddies tonight to have a look under the car with his inspection camera. I'm getting really bad mileage too, a bad flex plate will give bad gas mileage won't it?

 

[iamdub]

I'm going to my buddies tonight to have a look under the car with his inspection camera. I'm getting really bad mileage too, a bad flex plate will give bad gas mileage won't it?

I don't see how.

What are you referring to as "really bad mileage"? Do you have an actual MPG number? Did the bad mileage start around the same time as the noises?

 

[bigfootchiro]

I'm going to my buddies tonight to have a look under the car with his inspection camera. I'm getting really bad mileage too, a bad flex plate will give bad gas mileage won't it?

Flex plate won’t effect mileage