New tire program

[USMC-SSGT]

First post (I’ve been lurking, searching, and reading for two weeks now.)

Just picked up a new overland and ordering some goods for it. Of importance for this thread is some 20x9 wheels and Kenda 35x12.5x20 tires. I know I’ll need to pick up a programmer to flash for the new wheels size. Also read that the larger wheel makes the gear ratio effectively 3.25:1 so to compensate I’d need to be 3.88:1 for no change.

Without physically changing gears, is this handled by the new wheel size flash? Or, do I need to program 3.88:1 to “trick” the computer?? As you can tell from reading, I’m not the most mechanically inclined as far as gearing and car computers go.

Before pic added. Once the wheels and tires come in (and new nerf bars, front bumper, lift, tonneau) go on I’ll add the after in a few weeks.

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[CerOf]

You flash for tire size to fix the Speedo and transmission shift Points.

Gears in the axles are only fixed by physically removing what’s in there abs installing a numerically higher gear.

 

[USMC-SSGT]

You flash for tire size to fix the Speedo and transmission shift Points.

Gears in the axles are only fixed by physically removing what’s in there abs installing a numerically higher gear.

Thank you, appreciate the response. That clears it up that you’d only touch the gear ratios in programming if you have physically changed the gearing. Just wanted to be sure that there weren’t any quirks or tricks I’d be missing.

Not looking forward to crushing my MPG ?…but I suppose if I cared about mpg I’d have bought a Prius ?

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