I have a loud knocking noise when acceleration. I know its not the motor. It sounds like its comming from right below the firewall or maybe a little further back by the tranny. It gets louder the harder I accelerate.The car still pulls strong and I have not noticed any performace or diveability issues. I have not had a chance to get it in the air and look yet but was open to some suggestions before I get under it tomorrow.

I cant tell if its my headers hitting the floor
Bad U joint
Torque arm
Or the Trans


95 Camaro
Lt1
M6
Full length headers

 

I had the same issue with my long tubes , it was making my knock sensor go nuts . If you find the spot thats hitting some pieces of heater hose will get you by for a day or so until they melt . I had to change my motor mounts to poly and have some braces welded in to get mine to go away. Hope this helps .

 

Have you checked the trans mount? Sounds like it may be broken.