u/Acceptable-Sugar-974

Totally new to this. I am okay with how to ECM works, it's functions, etc. but not the files, bin, strategies, etc. Not the tuning parts.

I am probably on a different task path than most of you so there isn't a lot of searchable data on what I am trying to do.

I have a 2003 Ford E350 van, 5.4, 4r100 auto trans. PCM is totally stock.

What I am going to try to do is swap the transmission to something more modern like and 8 speed 8hp70. The physical isn't an issue with adapters and I will run a Maxxecu standalone controller for the trans. My issue is making the Ford PCM NOT throw trouble codes/check engine light for the missing trans data it will expect to see. This is an automatic fail for state inspections.

I have bought the Moates Quarterhorse and Tunerpro RT. I also picked another PCM for my vehicle from a wrecking yard that had the same part number.

My plan is to pull the bin off the stock PCM using the Quarterhorse and Tunerpro RT through the USB and then flash that to the junkyard PCM, which will then be the PCM I put in the van. I will go through the various transmission relate functions and turn them off in Tunerpro. I will save the stock PCM in a safe place just in case for later if needed. It's pretty worthless anyway.

Anything I should anticipate? Flaws in my thinking? I'm an idiot because...............?

Any thoughts pro or con would be helpful. I don't have anyone to bounce ideas off outside of Claude or ChatGPT and can't always trust them.

NOT looking to "tune" anything by the way. Just stay stock

Thanks in advance for any help

2003 Ford E350, 5.4, 4r100, OBD2 connector but OBD1 communication I think. California and smog guys have to dyno it.

I want to reflash the PCM to NOT look for transmission related signals other the the VSS. I plan to update the transmission to a modern version 8 or 10 speed and use a stand alone controller. I will convert the speedo Hall from the modern transmission to VS to the stock PCM for engine control.

Without the stock transmission in place, I will get a variety of codes and check engine light of course. I want to remove these inputs for the PCM so that doesn't happen.

Can I do this with Forscan? New to playing with Ford and coming from another car world so this is new.

Any help would be great and appreciated!