Thud under passenger seat,,,,,

[franknewman]

I have a 00 Grand Prix GTP i replaced the rack and pinion strut mounts struts sway bar and control arm bushings i have a clunk under my passengers side floor in the front when i hit the gas it clunks when i hit the breaks it also clunks anyone kno what it is?????....

 

[DIY Bob]

Sounds like your front sway bar is cracked on the passenger side.

 

[sheffy]

mine is doing the same damn thing... i changed everything except the subframe bushings..... check those out its pretty easy to check them

 

[Dtrick22]

if everything in the suspension looks alright I would check the motor mount..Mine does something similar but I would describe it as more of a vibration than a clunk, and it is caused from a worn out motor mount. Just haven't gotten around to replacing it though