Slight noticeable vibration after dm and clutch change

I recently changed the clutch and everything else associated with it on my td5 but seem to have developed small vibration which only seems to happen like when your say rolling to a junction and you drop into 2nd let the clutch out to proceed if there's nothing coming you hear it but would say on normal diving you rarely hear it. It's strange sort of vibration. It's only happened since the work was done. Props seem fine and they were greased when refitted just a bit strange