Hi everyone, i have a 06 Civic Si coupe and im having this issue where im hearing this rattling sound when im driving and its in every gear except for neutral and reverse. Gets louder the faster i drive and the Farther i drive also. People have said its the differential but i want to see what people think it is before i spend a crap ton of money buying multiple things and then it turning to be only one thing. Thanks i have a vid on youtube and will send the link when asked. Thanks

 

Hey bud , did you happen to find out what the problem was/is? I'm having almost the same problem but mine is only when going from nuetral into 1st but if I have the Rpm's too high when going into 1st the clutch grabs and something grinds, then makes this awful rattling sound in 1st and low 2nd gear but stops after 2 grand. If you happen to know the issue please respond so I could possible trouble shoot.

( I changed my clutch, release bearing, pilot bushing and resurfaced the flywheel.. all brand new)