Rumbling noise when de-cellerating on 2004 Honda Civic

D15Y-motor: Civic 150i just a little more than 72 000 clocked, all gearbox oils checked (OK) - still rumbling noise. Could this be gearbox or distributor?

Asked by for the 2004 Honda Civic
seek diag to be sure
2 more answers , 2 more comments
seek diag to be sure
The problem with sounds is we cant hear them! It needs to be driven by a mechanic that can!! Sorry but that is the way it is.
Thanks for your reply - was driven and tested by mech, quoted client for gearbox removal to check and repair
No way to argue with that diagnosis from here!