New 2023 engine in a 2020 RAM 3500 with Aisin but 2020 ecm (Can someone help me)

[Johnmy]

Hi everyone, I have a 2020 RAM 3500 but I'm installing a new 2023 engine and I have the new blank ecm still unprogrammed bought by my VIN for 2020. My doubt is that after I finish assembling everything,

1- I have a programmer that is going to program my truck from the factory with my VIN and then I want to do the delete with Efilive, but my previous engine had a cp4.2 pump and this new one already has the cp3.3 pump. Can you help me what would be the best option for me please?

2-Or should I give the programmer some instruction for some update so that the truck works correctly with the cp3.3 now?

3- And then I can do the delete with Efilive without problems?
Thanks to everyone. I appreciate your suggestions.

[Jim P]

Dunno why you bought a new ecm for your 2020, unless it was completely toast and bricked beyond recovery but if you’ve read through previous threads on the forum you’d find that yes parameters need to be changed for the different injection pump or just use a 2021 calibration and good luck on the emissions delete. Just sounds like your diving into things with zero clue.