Help with driveline slop and clunk?!

[RoushStage_3]

I have a 2007 roush 427R stock except for BMR lower control arms I put on and a white line adjustable upper control arm that came on the car. When I accelerate I can feel what I think is the rear end moving and it clunks. Same thing whenever I take my foot off the gas at any speed at all. I’ve already replaced the cradle bushing and made sure the UCA was tight.... what’s my next step? by the way it made this sound before I put on the LCA’s. Thanks !


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[eighty6gt]

It's normal, an S550 probably won't do this as much.

 

[01yellerCobra]

Did you replace the UCA mount as well? I've heard if you don't it'll clunk due to the size difference in the mounting bolt.

I had BMR lowers with the relocation brackets and a stock upper on our 06 and it never clunked. At least stopping and going. Hitting a bump with the crappy Eibachs was another story.

 

[RoushStage_3]

Did you replace the UCA mount as well? I've heard if you don't it'll clunk due to the size difference in the mounting bolt.

I had BMR lowers with the relocation brackets and a stock upper on our 06 and it never clunked. At least stopping and going. Hitting a bump with the crappy Eibachs was another story.

Yes it has the Whiteline upper control arm mount. I guess I’ll just put in a BMR non adjustable one and see if it’s rid of it. It’s really annoying cause it slams the whole car forward and back which is really annoying


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[01yellerCobra]

If you can feel it throughout the car you have a serious issue. I'd say you need to check the LCA holes on the chassis side as well.

 

[bl817]

the S550 has an IRS so the center section is bolted to the body, that in no way helps the OP. and yes as stated above, the bolt holes are different sized depending on what mods you get.