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How are you tuning your engine? I read somewhere you need to adjust/replace the governor springs but they were very vague on the details

Hey y'all! I've recently looked back into diesel swaps again. I was looking for a few things in a swap: cost efficiency, fuel efficiency, and being able to use my transmission. So my Jeep is a 2004 automatic and I assume I have the 42rle BUT I also have a TCM that's separate from the ECM. My...