Excessive bounce

[Utah2020ST]

Hi everyone, my name is Michael I own a 2020 ST with 68k miles on it. Recently ran into some issues with my ST having an excessive amount of bounce while driving 40-70mph. Ive noticed it goes away once I hit 70+ and once I get onto newer paved interstates. I Initially thought it was a bent wheel, failing rear shocks or just low quality tires. So I went all in and replaced wheels, tires, and rear shocks. I still have this problem. I already check all suspension components and nothing has excessive movement.

Any ideas?

 

[Combatvet]

Time to check the springs, is it lowered? Could be bad shocks, low quality tires like you mentioned. Too many variables.

 

[Utah2020ST]

Time to check the springs, is it lowered? Could be bad shocks, low quality tires like you mentioned. Too many variables.

I went with the PIU rear shocks. Didn't really think of the springs. I have tires road force balanced and even moved to a 20" rather than sticking with the 21"

 

[Cdubya]

with that many miles, just replace the front struts too. check all four sway end links.

 

[Utah2020ST]

Time to check the springs, is it lowered? Could be bad shocks, low quality tires like you mentioned. Too many variables.

Someone mentioned cv axles to me as well. But that didn't make sense to me as cv axles usually cause issues when accelerating. Ill have to pay attention and see if that might be an issue