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I too am interested in doing a nv3500 mt conversion on my 2004 dodge Dakota and I was curious if you ever figured out how to do it on your truck.
Convert all the hard parts over the manual setup, then find a 2004 MT ECU & harness, swap that in and set the vin to yours & you should be good to go. On the 2002 I think it is easier with the trans controller being separate which is why I suggest finding the MT ECU.
I've done the swap on the Ram back in 2015 at 225k miles & fell in love with my truck all over again. Currently sits at 499k & needs a water pump (bearing is bad).
