Hello, I have been diging for a while to find out how to do a segment swap on a transmission or the engine calibration and have not found a "step by step" post to do this yet.

Here is my dilema...
I have a 454 and 4l80e I am running with the 0411 ecm. the current OS I am using is 01270003 and the trans calibration is 9358280> this 80e tans calibration will not work in 4wd low as the shift tables are no being changed properly for 4low shifting.

(from what I gather)I think I can use a 5.7L express van tune with OS 12212156 and a 6.0L 4x4 truck/4L80e tune OS(12212156) and swap the trans segments and then take that file and copy all the tables from my 454 tune to make this new tune/file run properly......
BUT
I need help on how exactly to swap the segments
Any advice would be greatly appreciated
Robby