Increasing vibration at 70mph

[Bschn140]

We purchased our 2020 ST a year ago and have had no issues until now. I have 66k miles so I'm outside of powertrain warranty. I started having a vibration at 70mph on the highway and now I'm finding out about the CV axle and FADA leak issues. Of course both of these issues are on my vehicle.

I looked under the ST and found my CV axle boot was destroyed, and I have a leak near the oil pan (o-ring). In order to get the vehicle back up and running quickly, I made the decision to swap the CV axle last night to get rid of the vibration. Unfortunately, after the swap, I still have a vibration at 70mph.

The vibration didn't show up on the first test drive up to 80mph. Then, the next time it showed up at 70mph. It gets increasingly worse. I was unaware the fluid was draining from the front differential and I plan to add/check that today.

Any thoughts on what is causing this? Failed FADA? Front differential issue?

 

[Psyko_323]

We purchased our 2020 ST a year ago and have had no issues until now. I have 66k miles so I'm outside of powertrain warranty. I started having a vibration at 70mph on the highway and now I'm finding out about the CV axle and FADA leak issues. Of course both of these issues are on my vehicle.

I looked under the ST and found my CV axle boot was destroyed, and I have a leak near the oil pan (o-ring). In order to get the vehicle back up and running quickly, I made the decision to swap the CV axle last night to get rid of the vibration. Unfortunately, after the swap, I still have a vibration at 70mph.

The vibration didn't show up on the first test drive up to 80mph. Then, the next time it showed up at 70mph. It gets increasingly worse. I was unaware the fluid was draining from the front differential and I plan to add/check that today.

Any thoughts on what is causing this? Failed FADA? Front differential issue?

Are you still running stock tires by any chance? Or tires that contain foam on the inside to help with road noise? I'm asking because I had an increasing vibration that kept getting worse. I bought a new set after reading that info here and went with some Michelin Pilot Sport tires. Vibration is now gone.

 

[WildWeasel86]

Possibly shocks/struts. I have heard some folks have a wheel bearing go out near 70K miles.

 

[Bschn140]

Tires are Goodyear F1 Asymmetric 5. I did have them rebalanced by the cheap tire place down the road. It was the same thing. It was fine for the first test drive then started vibration at 70mph on second. Strange.

 

[Bschn140]

I will move my front tires too the back to check.

 

[Mattswanson15]

Same for me what Pskyo_323 said when I would drive around 70-80 on my stock tires it would vibrate pretty bad and it was getting progressively worse but once I replaced them it went away.