I'm not sure I agree, I have a zf6 with the entire flange busted off and the transfer case flopping around right now.
His carrier bearing was out and causing a vibration slightly, and there was a spring that had fallen out of place in the factory dual mass flywheel causing the engine to seem to run a little rough also...
Truck is getting a southbend clutch and flywheel and now getting a rear zf6 transmission housing and a transmission mount and carrier bearing...