So are you worried at all about that cp4? I had an LML lemon back in 12 that the dealer never got to run right. Some of the subs i use have had that injection pump let go and it cost plenty to replace the entire fuel system. Sometimes the dealer will cover it if they find absolutely no rust or contamination. That pump was always on my mind. I ran an additive every tank and added a FASS 95 to hopefully help it last.
I will say that my 12 with the Allison was a great transmission.