Hey guys, need your advice again. I have a 2013 Mustang GT, 6-speed MT-82 with 3.73 gears. I have a loud whine/howl coming from the rear end of the car. It increases with my speed. Below 30mph, it's not noticeable unless you're listening really hard for it. As you get up to 60mph, it gets much louder. Above 60mph, it's very noticeable and very loud. It doesn't matter what gear I am in and the volume of the whine doesn't increase or decrease depending on gear. It only varies (getting louder) with speed. There's no volume change on deceleration. If I take my foot off the gas, the whine almost completely goes away. As soon as I give it any throttle, even 1%, the noise is back with the same loud volume. I'm also hearing a bit of clunking and rattling at certain times on deceleration and just maintaining flow of traffic speeds.
I got the car about 3-4 months ago. I noticed this noise about a month ago and it was fairly quiet and bearable. I could hear it more with windows up as it droned a bit in the cabin. Couldn't hear it with windows down. Yesterday, this noise suddenly got a lot worse and now it's very loud and drones a ton in the cabin. Windows down, it can still be heard. It overpowers my Corsa mufflers and resonator delete.
My 2013 Mustang GT has 3.73 gears from the factory. Stock driveshaft. I have J&M lower control arms, J&M LCA relo brackets, a non-adjustable upper control arm and mount (unknown brand), panhard bar, Koni yellows, and Steeda springs. I've heard the stiffer you make the rear end, the more NVH you have.
I'm thinking it's coming from the driveshaft or differential. I don't believe there's been any work done to the differential previously. I've heard 3.73s are typically whiney but I don't think this is a situation of "it's just a regular noise and it'll be fine" as it got much louder this weekend to the point where the car is annoying to drive. I've heard it could be a lack of diff fluid but I'm doubting it based on the sudden increase in volume and I don't have any leaks in the diff.
Any thoughts as to what it could be and where I should start? Thanks for the help in advance!
I got the car about 3-4 months ago. I noticed this noise about a month ago and it was fairly quiet and bearable. I could hear it more with windows up as it droned a bit in the cabin. Couldn't hear it with windows down. Yesterday, this noise suddenly got a lot worse and now it's very loud and drones a ton in the cabin. Windows down, it can still be heard. It overpowers my Corsa mufflers and resonator delete.
My 2013 Mustang GT has 3.73 gears from the factory. Stock driveshaft. I have J&M lower control arms, J&M LCA relo brackets, a non-adjustable upper control arm and mount (unknown brand), panhard bar, Koni yellows, and Steeda springs. I've heard the stiffer you make the rear end, the more NVH you have.
I'm thinking it's coming from the driveshaft or differential. I don't believe there's been any work done to the differential previously. I've heard 3.73s are typically whiney but I don't think this is a situation of "it's just a regular noise and it'll be fine" as it got much louder this weekend to the point where the car is annoying to drive. I've heard it could be a lack of diff fluid but I'm doubting it based on the sudden increase in volume and I don't have any leaks in the diff.
Any thoughts as to what it could be and where I should start? Thanks for the help in advance!
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