Laylow_lalo

I have a 2008 gmc sierra Denali 6.2 awd and I bought it with a bad engine, the engine was no good for a rebuilt so I bought another engine off a 2012 Yukon that had original dod, but mine didn't so I did a dod delete and refreshed the whole engine, now I never drove the truck before I bought it so I don’t know if it was already like that so I asked the seller and he said trans was rebuilt February 2025 and still has warranty he also did a engine rebuilt but got locked up do to bad oil pump wich was reason for selling it, he said that furring the time he had it running it was also kicking and transmission shop said it was normal do to the tune that it has on 93, the issue I have is that it shift hard in very gear when I drive it normally and it pulls me back, put my autel and have pressure sensor codes, I asked around and they said that the transmission probably need to re Learn values, could the issue be the re learn or the new 2012 engine or the transmission itself self I need help