welp here is the story, i got my truck back today brand new shaft on it, the problem was from the "aftermarket dual exhaust". apparently there was a clamp that was scraping the shaft when i had a load, as well as after the incident with the pipe that fell off and ground a good chunk off a while back, but anyway the guy said he'll replace it under warranty and if the "aftermarket dual exhaust" scraps it down again he wont replace it, so the stock exhaust is now re-installed after i brought it home.
So i am happy that even tho an aftermarket part caused the problem they still covered it under warranty