6.1 Swap Won't Rev Past 3K HELLLLPPPPP!!!

Yeah the downstream O2's are only for cat efficiency, and should not cause a limp mode. I have worked on a bunch of rams that they were unplugged and it still ran just fine.

The manual trans has always been offered in a 2500. It's just a rare option. And the pcm's are hard to find. I have a feeling yours is an auto PCM though, I say that because of the egr code. I'm not 100% but I don't think the 2500 had egr. For any year. I could be mistaken though. I would hook up to it and pull the vin and cross it with carfax. You can see basic info without paying and see if it's a 2500 or 1500. If it's a 1500 I guarantee it had an auto trans. They never offered a manual with the Hemi in a 1500.