i just had my transmission, clutch, and flywheel replaced at infinit and ever since i've been hearing this knocking noise that i've never heard before. i took it back to inifiniti but they said that they couldn't replicate the noise. it happens when i go over bumps. at first i thought that it was coming from the front left but when my friend heard it they said it sounded like it was coming from all over. does anyone know what could have caused this?

 

Loose sway bar maybe?

 

Take your car back to Infiniti and ask them to put it on the rack and make
sure everything it tight. R&R on the trans/clutch shouldn't have involved the
swaybars but a cross member is a possibility or even driveshaft....
Gary

 

don't mean to bring this back up but I am having the same issue too after me and my friends did my clutch/flywheel install. my friend said we didn't cross bolted down the "cross member" so we re-did it and the first few days it was gone! but as i drove the car more each day, the sound came back louder and and louder is day i drove it and now it comes consistently all the time! lol is there a torque spec for it or anything?