trail rated
Full Access Member
***Models with 45RFE only***
I followed what the 4.7 dodge guys had done. I used their instructions and the FSM wiring diagrams to stop the ignition timing ****** at shifts on my KJ. There is a wire (yellow with green tracer stripe) that signals the PCM when to ****** timing. Simply snipping the wire removes that communication and stops sloppy shifting. I did it and so far I am impressed. Before the snip you could feel the Jeep slow down even before the shift. Now, at part throttle the shifts seem "neutral", the Jeep doesn't lurch forward but it doesn't slow down either. At WOT the shifts feel nice and positive (Jeep lurches forward slightly).
It seems to have no effect on transmission longevity as there are some that have 150K+ with no problems, no check engine light either.
So, unscrew and remove the wiring harness from the TCM, then take the plastic cover off. Snip the #10 wire (it is yellow with a green tracer, see bellow for connector pin out), make sure you are snipping the proper wire as some people on the dodge forums have accidentally snipped the #17 wire (yellow w/ dark blue tracer). If you snip the #17 wire than the trans will shift way to hard. Reinstall the connector onto the TCM, reinstall the screw, then reinstall the plastic cover.
That's it!
I followed what the 4.7 dodge guys had done. I used their instructions and the FSM wiring diagrams to stop the ignition timing ****** at shifts on my KJ. There is a wire (yellow with green tracer stripe) that signals the PCM when to ****** timing. Simply snipping the wire removes that communication and stops sloppy shifting. I did it and so far I am impressed. Before the snip you could feel the Jeep slow down even before the shift. Now, at part throttle the shifts seem "neutral", the Jeep doesn't lurch forward but it doesn't slow down either. At WOT the shifts feel nice and positive (Jeep lurches forward slightly).
It seems to have no effect on transmission longevity as there are some that have 150K+ with no problems, no check engine light either.
So, unscrew and remove the wiring harness from the TCM, then take the plastic cover off. Snip the #10 wire (it is yellow with a green tracer, see bellow for connector pin out), make sure you are snipping the proper wire as some people on the dodge forums have accidentally snipped the #17 wire (yellow w/ dark blue tracer). If you snip the #17 wire than the trans will shift way to hard. Reinstall the connector onto the TCM, reinstall the screw, then reinstall the plastic cover.
That's it!
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