Originally Posted by BlackSeven
My regular cab has issues with the driveshaft (Needs a longer double cardan shaft), but your truck shouldn't have any problems since you have a carrier bearing in the shaft. Unless they didn't put the shims in right (or not at all). A binding driveshaft is easy to diagnose, cause you'll get all sorts of vibes, especially on deceleration.
I wouldn't call what I've been getting a vibe...its more of just a noise like a lose piece of metal moving around, if that makes sense
. It is most prevalent when I let off the gas and coast, like you said. The only time my truck physically feels like something is severely out of place is when I go into reverse and it makes a hellacious clunk.