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Thread: Gear swap and programming with SC Flashpaq

  1. #1
    Old Timer USMC Wrangler's Avatar
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    Gear swap and programming with SC Flashpaq

    One of the biggest surprises of the day was after the gear swap. I started driving down the road and something didnít feel right. I tried to manually shift my auto (Ď13 JKUS) and nothing changed. I had programmed 4.56 in with my Flashpaq before I drove an inch. I had read of that issue of limp mode if itís driven BEFORE programming.

    I went back to my buddies and told them what was going on. Then I remembered counting the teeth on both ring and pinion gears to confirm a match. The rings had 41 teeth and the pinions 9. Dividing the two works out to 4.555555555555556. Again, I plugged 4.56 in the axle ratio change initially. I got the DTC of P0731 Gear 1 Incorrect Ratio.

    The fix? Program in 4.55 instead of 4.56!

    Maybe this has been covered here, but I couldnít find it. Iím no engineer but itís crazy to me that .01 difference could cause this. I also realize 4.88 is probably more common of a ratio. I do have to wonder if anyone else has experienced this and had to do something similar?


    .................................................. ..............
    Overall "build thread"
    http://wayalife.com/showthread.php?2...ker-quot-build

    DIY trail/tube door build http://wayalife.com/showthread.php?24449-My-DIY-Doors
    Last edited by USMC Wrangler; 03-04-2019 at 05:58 AM.
    2013 JKU Sport "Spider" with some EVO goodies and a chop here and there

    DIY trail/tube door build http://wayalife.com/showthread.php?24449-My-DIY-Doors

    Overall "build thread" http://wayalife.com/showthread.php?2...ker-quot-build

  2. #2
    Old Timer USMC Wrangler's Avatar
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    Hereís an update from my own trial and error.

    I just reinstalled the 87 octane tune from the Flashpaq. When it was done I went for a test drive. It went back to the limp mode feeling and 1st gear error DTC. Limped home and plugged in again. Updated the gear ratio from 4.55 to 4.56 and it worked this time. Other than reinstalling the tune I canít think of any reason why it wouldíve done this. Well, except... Superchips! I truly have a love/hate relationship with this tool. I love it when it programs correctly and I hate it for all the work arounds and inconsistency itís displayed.
    2013 JKU Sport "Spider" with some EVO goodies and a chop here and there

    DIY trail/tube door build http://wayalife.com/showthread.php?24449-My-DIY-Doors

    Overall "build thread" http://wayalife.com/showthread.php?2...ker-quot-build

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