engine mounts are ruled out as i got the engine mount inserts to stop them from moving. the rears have also washers to keep them seated where they are supposed to... clutch was changed to xtreme HD clutch and xtreme lightened flywheel in january this year. to more accurately describe the noise. u know the "locking into gear noise when u change to the solid bearing for the gear selector cables. its like "clunk clunk" (but not as loud, have to listen very carefully to hear it). doens't happen over humps or bumps. thrust bearing def not it because no noise when i disengage the clutch/neutral.