So about a year and half ago I put a dual disc Southbend clutch with new throwout and pilot bearings and input shaft in my 01 cummins, haven't had many issues till this past week I started noticing a chattering sound while taking off, almost like tin metal being drug around something. Now it's getting a lot worse and louder. Continues at low speeds until I'm past about 1500rpm, if I push in the clutch it stops. Seems to drive normal but since this is my only vehicle and drive a LOT for work I'm worried about breaking down since idk how serious this is. Any suggestions or thoughts on what it might be?

 

It sounds like a through out bearing to me but i have seen this with a pilot bearing also did you pack the pilot bearing befor you installed ?