Knocking or grinding possibly from transmission

First I replaced the clutch with clutch kit. Have new motor and transmission mounts. Replaced universals. So last couple weeks I have been getting this like knocking noise and I can feel it at my feet. The funny thing is that it does it when moving and at a full stop. I am thinking it may have something to do with a bearing. When the clutch is in neutral or in gear still makes that sort of knocking sound. At high speeds its very consistent and loud. When drifting down a hill in gear with clutch peddle down or neutral same sound. I have a hard time trying to catch the sound when parked but can't figure out where it is coming from, but it seems to be right at the oil pan and transmission. What could it possibly be?