Yeah, it's probably because of the nuetral safety switch. I don't know if your harness will plug into the neutral safety switch(it has 4 prongs facing up-driver side top of trans) on the trans because it was for a manual-you may need to replace that section of harness with one from an automatic(junkyard or Ebay). In the world of computers swapping a manual for an auto isn't that straight forward.
1989 Mustang T5 to AOD swap
my t5 was done so i had a aod in the garage and bolted it up with a 2500 stall converter. now the car wont start. somebody told me its the nuetral safety switch but i have no idea what that is or where its located or what i have to do with it. the car is a 89 5.0.
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I just thought of something. Do you still have the clutch pedal assembly in there? It might be the switch on the clutch pedal.
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