I have been thru the dash 4 or 5 times to check all the wiring particularly the grounds, for tightness and cleanliness and have added a few redundant grounds from the existing ground lugs straight to the neg post of the battery just for the Hell of it to verify that the grounds are all secured.
I haven't yet installed it but I did go to the junkyard and found an identical Durango and pirates it's complete underhood wiring harness, as once I receive the gov sensor and transducer that would be all that would be left that I know of....

One thing that was weird was my original trans was bone dry on the outside but when I went to disconnect the wiring was that the inside of both the 8 wire plug and the 5 wire neutral switch were saturated with oil... I soaked the [censored] out of them with electric contact cleaner when I put this other trans in there.