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== Speedometer Pinion Differences == This writeup is meant to assist someone who is trying to correct their speedometer after changing their differential to a new final drive ratio, or after changing their transmission.Correcting your speedometer after putting different-sized tires on your car is beyond the scope of this writeup, and therefore will not be discussed except for this note: With a little math, it may be possible to use this writeup to get your speedometer a little closer, if not precise, depending on what tire size you've chosen. https://dev.z31library.com/xenonzcar_archive/2025siteimages/pinionsendingunits.jpg
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