Bouncing '19 Bullitt

[K0094]

I have a 2019 Bullitt with about 15k on the odometer and the car is equipped with magneride. The magneride rear shocks were leaking and replaced about 3k miles ago.

The car bounces driving down the highway at 70-80mph, even in sport or track mode where the shocks have noticeably firmed up after changing the drive mode. When having a conversation on the highway, my words are not clear from the car bouncing. My voice/words sound as if i was hitting my chest while trying to talk. My first thought would be the shocks are bad, but both rears were just replaced and shocks definitely get firm when the drive mode changes. This is my daily driver.

I recently modified the IRS which includes:
- replaced the LCA front bushing with a spherical bearing
- replaced the knuckle to toe bushing with the Ford Per bearing
- BMR double adjustable toe rods
- BMR vertical links, spherical/delrin
- BMR lockout lvl 2
- BMR IRS/subframe support brace
- All bolts torqued to spec with the suspension loaded as it would sit (clocked).

The springs are stock on the rear. Front suspension is unmodified. It didn't bounce prior to modifying the IRS.

Has this happened to anyone else after modifying the IRS?
Suggestions to getting rid of the bounce?

Thanks for any feedback.

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[KilgoreLSU]

How do you know it's the rear that's bouncing and not the front? When the rears failed, did it bounce the same way?

 

[Swtbabybilly]

How are the front struts? The rear is now very stiff with brand new shocks and the front is stock with struts that are 6 or 7 years old now. If the front struts are bad or going bad and the rear of the car is now very stiff this could definitely cause a bounce or floating feeling when driving at highway speeds, best of luck man

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