01 ford explorer i replace engine now the automatic transmission will not go in

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gear. why? After installing a new engine into a 01 ford explorer The transmission does not put a car in gear does any one know why this is

 

[C-Reeds]

If it is the same engine and is hooked up right to the transmission itself, some of your wiring is probably off. Computers are a major part of these cars, and if you didn't hook everything up right, it could cause a problem.