1997 5.2L V8 + 44RE Shifting issues Jeep Registry
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1997 5.2L V8 + 44RE Shifting issues

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Hey everyone! Brand new to the forums. I recently did an engine/transmission swap on my 1997 Jeep Grand Cherokee. I upgraded its 4.0L 6 cylinder engine + 42RE transmission to the 5.2L Magnum V8 engine + a remanufactured 44RE transmission

After a test drive, I went to shift it through its gears. I shifted all the way down to 2nd gear, and the drive functionality completely stopped. Now it only goes into park, reverse, and neutral, and when the shifter is in the 2 position the vehicle goes in reverse.

The PCM is brand new. The transmission relay & fuse is good. I also pulled the whole engine/transmission wiring harness and inspected it, there are no open or shorted wires - full continuity from the 8-pin connector to the PCM as well as the other transmission sensor connectors.

What am I missing? I’m troubleshooted out. How can I specifically diagnose the issue?

- P0713
- P0743
- P0753
- P1762
- P1763
- P1765


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