Originally Posted by primo spaghetti
is this a specific issue only related to the 2011 with the 5.7?
No, the 4.7Ls are affected, too.
But as I've pointed out, this is only a noise issue, not a durability issue. The problem is rattle of the turbine hub spline when the torque converter clutch (TCC) is fully applied. Splines with too much clearance (backlash) can exhibit a "warble" noise (which I think has been best described as sounding like a Frisbee sliding across smooth concrete). The spline clearance will vary from converter to converter (due to manufacturing tolerances), so some are quiet and some make noise.
So if you get the noise and it annoys you, get the converter replaced. But if you have to really listen carefully to hear the noise, or aren't sure you even have it, then you don't have to replace the converter. It is not
going to self-destruct prematurely!