Gear Swap and spedometer reading

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Feb 26, 2008 | 08:56 AM

Thedieselkid

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Gear Swap and spedometer reading

I am finally swapping my 3.54's for 4.10's and am wondering how I can recalibrate my speedometer. Is this done by a gear in the trans, or do I need to reflash something in my computer. Any help would be great

Thanks,

Paul

Feb 26, 2008 | 10:29 AM

rebal

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From: Yuba city Kalifornia

reflash of the ECM

Feb 26, 2008 | 12:44 PM

Thedieselkid

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Can the tire size also be accounted for in the ECM or do I need to figure out a percentage?

Thank you,

Paul

Mar 8, 2008 | 11:18 AM

J OOPS

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From: Alaska

original truck has 3:54 gears and installed 4:10 gears 5" lift and 35" tires equaled out to having the same engine rpm as the stock gears and tires. No change to computer.