Clunking or Rattling sound when Accelerating 99-06 Silverado

Have a clunking or rattling, rock rattle sound under your truck? Check your starter could have a loose shaft that touching your flywheel or maybe your catalytic converters are worn out and has all loose material broken apart inside.
Here is other video I found with same rattling sound issue as mine. Hope this helps!
Phillip Bailey
• 2000 to 2007 GM Truck ...