helping work on a friends 2010 dodge dakota. the factory 4 speed, 42RLE transmission failed and stopped working in 3rd and 4th gear. he bought a 2009 dakota for parts, and it has the 4.7l v8 and a 545RLE. we are going to use our school's HP tuner to read both the pcm from the parts truck and the good truck, and try to do a segment swap from the parts truck to the good truck, to swap the transmission files to try to make the truck shift properly with the new transmission.

currently the truck drives in 2nd and 3rd gear (the default gears when the 545RFE doesn't detect electronic control). the PRNDL shows a box around each gear, and the PRNDL error flag is active when I plug my own obdII scanner in. Has anyone ever done this swap before? we are pretty deep in if this isnt going to fix it. we do not want to run a standalone ECM if we dont have to, because that will get complex and expensive very fast.

any help or advice is apricated. next week when we do it I will report back with the tune file and any results. wish us luck