ok heres the deal peday assy will bolt into yours the crossmember will ve dif and possibly your rear d shaft um the wiring its not as easy as jus switching ecu's but if you put your engin harness on the new motor ant tranny you can trick your ecu basicly you need your computer to think its in either neutral or park otherwise it wont start you can achieve this by pulling the nueteal safety switch off of your auto and splicing the wires together the only down to this way is that ur runner will start in gear with out pressing the clutch if you want the manuel ecu your either gonna have to switxh the entire harness and with it being a first gen runner to third gen truck plugs arent gonna march up an stuff if you want a conversion harness made so you can get the best of both worlds shoot me a pm and well get ya fixed up...o one other thing make sure to use the knock sensor that goes with your ecu the plug may fit on the other but theres diff knock sensors so use the one from which ever ecu you use hope this helps ,
Cullin