Anyone tried the Rough Country tire size programmer?

OFC Ranger

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Jack
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So supposedly it claims that in addition to updating the computer for the larger tire size to correct the speedometer it also updates your gear ratio programming as well for better shift points on the larger tires. At sub $140 on Amazon it may be something I am looking to purchase as I am not ready to go the full tuner route yet. However I'd like to see if anyone else has any experience with it.

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