I went to the dealer today to have them listen for gear whine and got to talking to the diesel service advisor about the CP4. He says his dad has a 5th Gen asymmetrical 6.7 so he's aware of the fervor. He tells me that he's had 3 in for CP4 replacement (Northwest Phoenix dealer) and all have been under 2,000 miles. Last one had an $18,000 repair bill. He said he's seen both the asymmetrical and symmetrical fail. He also said he heard a rumor that RAM was going to try and go back to CP3 and that the dealers don't know if a recall is coming or not but gave the impression that the issue is in the works at the higher levels.
Some of what he said sounded like the same half-informed stuff I see on forums and FB and I'm reticent to just take what he says as gospel, but part of me thinks, well, the dude is a RAM service advisor at a major city dealer that sees a lot of volume so if any of us know anything it would be him right?
I still don't buy that a CP3 change will happen and I'd put the chance at recall at less than 25%, but that's just me. I'll stay informed on the issue because it interests and may affect me one day, but I'm Ivan Drago about it at this point. If it dies, it dies.