How Do I Program A New Gear Ratio?

[Moparriggan]

Hello friends,

What's the best way to program gear ratio into my truck?

I replaced the 3.42 ratio with 4.10 and I need to correct that setting in ECM/time.

Can I use ALPHAOBD?

I have an MM3 programmer so should I have the program writer make that correction?

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[Chrisn162001]

You don’t need to.

The transmission gets its speed data from input and output shaft speed, and the Speedo receives its data from the wheel speed sensors.

The only way I know is to add it to the sales code in the BCM, but it’s not needed again.


Sent from my iPhone using Tapatalk

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[Mackrd460]

The question is, where did you get the 4.10 gear?

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