Under hard acceleration, I get a singular bump sound from the rear. Sometimes I get this bump noise when I start only moderately from a stop sign. The mufflers bump up against the CS rear cutouts when I make a sharp turn left or right. But this noise sounds different, like a suspension noise when the weight shifts to the rear. I recently re-tightened up the rear bolts and added red loctite.

Current suspension modifications:
Koni Sports (Yellows)
FRPP K-Springs (Eibach Pros)
Steeda LCA and UCA
Steeda Panhard Bar and Brace.

I never checked the pinion angle of the driveshaft.
What noise does this make when out of spec?
I adjusted the UCA .25" shorter to compensate for the 1.5" spring drop.

My LCA bushings look more compressed than most pictures.
I torqued the bolts to 129 ftlbs, the car was under load, but not exactly level.
Can a LCA bushing make this noise?

Will any of this help? Soon to install modifications to be ESP legal:
Remove Steeda LCA
Install FRPP Rear Sway bar
Install Strano Front Sway bar

Any help would be appreciated.

 

Did your Steeda UCA come with the stepped spacers?

 

Yes, the aluminum inserts for the forward bolt.