Clutch chatter

I had this a few time through the years, If you recently had the clutch replaced then oil or grease may have gotten on the pads and this will cause some banging and clattering. I forget why I did it when I put the Long Tube headers and mid-pipe on, but for some reason I remembered pulling the clutch cable housing on the outside of the bell housing and needed to lift up on the pedal to reset the cable after I put it back on. If you don’t the pedal feels lighter and doesn’t let it fully engage. Lastly and my best guess check the clearance around the trans, the mid-pipe might be contacting the trans and you may feel, and hear them banging together. They might look ok but you should have several inches of clearance. Have someone aggressively shake your exhaust pipes and watch to see if it moves up and makes contact. If you check these and it all looks good then keep searching.

More than likely clutch chatter....I had a ram clutch once that everytime I took my foot off the clutch it sounded like someone was under the car beating the floorboard with a hammer lol