"Fooling" the ECM?

[Sidewalk]

What I don't understand is how you wouldn't immediately notice the difference. Lower gearing would feel like you just dropped off a trailer. You would immediately feel the increased acceleration just letting go of the brake pedal.

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[DrummerDudeNJ]

As a side note.... I did find this handy RPM/Gear Calculator tool:

Wrangler JL RPM Calculator - Go 4x4 It

 

[jadmt]

Yeah so I don't have enough info from the post I saw on what the exact specs are for the issue, but let's use my Jeep as a pseudo test subject:

2018 Wrangler JL Sahara Unlimited 8spd auto
3.45's swapped to 4.56's
Tire size is just under 35", but resting size is 34"

If the new tire size and new gear ratio were flashed in, but gears never installed, would that cause issues??

100% yes

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