Starting to get this clunking/clattering from around the bellhousing area when the truck is cold, can feel it through the gas pedal on acceleration. Everything running alright and doesn't feel like I'm losing power or anything, but sure as heck doesn't sound healthy. Ideas?

 

As long as it is ridiculously loud, it seems normal for your truck to do that when its cold.

 

Maybe an exhaust leak. Get down under the hood and truck and find it.

 

its not exhuast whatsoever. It's when I put it in drive only it seems.