Yep, the shifter fork was worn out in the transfer case. It eventually would not even engage anything but natural.[emoji31]
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I did a 5.3 swap into a 2006 Jeep Unlimited a couple of years ago. My mileage was 15 to 17 mpg after the swap. I then took it to a friend who tuned it to the Jeep, all the shift points were wrong as my donor 5.3 computer thought it was still in a Suburban. He adjusted several parameters as we...