My truck in drive makes this clicking noise that I can only hear sometimes even after its warmed up. If I put the truck in park it'll make the noise stop. I'm thinking it might be idle pulley maybe any ideas?

 

While driving, or even when you are standing still but transmission is in drive? 2wd or 4wd?

 

Standing still but in drive like at a light or drive thru is when I usually can hear it. 4wd

 

Could be a lot of things, but you could start to locate sound by taking of the belt and running the engine. If the sound is gone, it's something on the belt drive. If not, maybe check the flexplate.

 

Maybe exhaust leak or even the torque converter

 

Changed my idle pulley and tensioner, noise still there although needed to change those anyway. Brand new exhuast on the truck and I had the trans rebuilt a year ago but maybe the converter is already bad or flexplate. Sounds like the clicking noise is coming from front of the trans by the oil drain bolt. Took a video of it, kinda hard to hear

 

I'm betting torque converter, torque converter bolts, or flex plate