Need input on bounce rear end after lowing with H&R springs

[Dutchsho11]

I lowered my SHO about 1 1/2 week ago. I put new rear shocks on when I did it. I used KYB G2 shocks my ass end is bounce, now is this normal for our cars? I talked to one of my friends and they recommend the stock shocks in the back I did have the Performance package on my SHO. Thanks in advance everyone.

 

[bpd1151]

Never used the KYB's, nor am I familiar with them, however, when I had H&R's in on my SHO, never experienced any bouncing.

I also had the stock (Non-PP) suspension in during that entire time the H&R's were installed, no issues.

Toss some weight in the trunk, sandbags, a gym bag filled with workout / free weights, and then drive around like that for another week or so.....

I would be willing to bet your springs are still simply trying to settle and find their place so to speak.

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[Heelfan1]

I lowered my SHO about 1 1/2 week ago. I put new rear shocks on when I did it. I used KYB G2 shocks my ass end is bounce, now is this normal for our cars? I talked to one of my friends and they recommend the stock shocks in the back I did have the Performance package on my SHO. Thanks in advance everyone.

Did you cycle the shocks before installing them? (Running the cylinder all the way up and down a few strokes).  I've made that mistake before and new shocks will bounce like old worn out ones due to the fluid not being properly distributed throughout the shock.

 

[Dutchsho11]

My mechanic put on everything for me. We are good friends and he's a master mechanic so I hope he knows how to put shocks on.

 

[MiWiAu]

Do the KYBs have adjustable rebound damping? I assume the lower springs have a higher spring rate to help control the vehicle mass over a shorter distance, which means more stored energy with bump inputs. Without increasing rebound (or if the KYB has less rebound than OE) you could see an increase in bounce. Lower compression damping vs stock could affect it too (allowing more spring compression).


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[Dutchsho11]

I will ask my mechanic and see what he says. This is so upsetting.

 

[ZSHO]

It could be just that the KYB Shocks are not compatible with the PP SHO and only made for the Non-PP SHO and even the Springs have different codes, suspension which Code E represents the PP only.
Did your mechanic have a chance to measure the length of the shocks between the two for comparison. ?
Best of luck to ya. Z
http://www.tascaparts.com/auto-parts/2011/ford/taurus/sho-trim/3-5l-v6-gas-engine/rear-suspension-cat/shocks-and-components-scat

 

[Dutchsho11]

So just an update. Both of my rear shocks blew out they were covered in fluid when we got it up in the air. So KYB not good at least for a lowered SHO bought the Ford shock it is thicker then the KYB shock also. So with in a week destroyed new shocks. But now all fixed no more  bouncing. Thanks for everyone's input.

 

[ZSHO]

I had a feeling the shocks were not compatible but any how glad things worked out accordingly with the new Motorcraft's,enjoy.  Z