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If you are even entertaining a PCM replacement, I would do that before all that work. Your Jeep brain making inaccurate decisions could make things appear to be broken. I know a guy who went through two transmissions and it was the PCM all along.
 

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He’s got a 2005 with four harness connectors. We have three. The fourth is for transmission control. WranglerFix sends out the 05 and 06 PCMs ready to go according to the VIN number.
 
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