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Jeep Wrangler JK
JK General Discussion
J-Scan tire change broke speedometer and threw lots of codes
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<blockquote data-quote="MacGuyver" data-source="post: 455868" data-attributes="member: 18877"><p>If you have an automatic you really want to be as accurate as possible. The 'running' diameter of the tires is them on the ground. Probably measure all four add that up and then divide by four for the best result. If you are off it will mess up your shift points.</p><p></p><p>If you have a manual it is not as important. However, set it correctly so you know the mileage on the vehicle. My TJ had the wrong gear (TJs use a gear in the transfer case to set the speedometer) for who knows how long. I also have no idea how long the 33" tires have been on it so I don't know what the actual mileage is on that vehicle. It could be well over 10,000 miles off. They originally came with 27 -28 inch tires.</p><p></p><p>Set your speedometer!!</p></blockquote><p></p>
[QUOTE="MacGuyver, post: 455868, member: 18877"] If you have an automatic you really want to be as accurate as possible. The 'running' diameter of the tires is them on the ground. Probably measure all four add that up and then divide by four for the best result. If you are off it will mess up your shift points. If you have a manual it is not as important. However, set it correctly so you know the mileage on the vehicle. My TJ had the wrong gear (TJs use a gear in the transfer case to set the speedometer) for who knows how long. I also have no idea how long the 33" tires have been on it so I don't know what the actual mileage is on that vehicle. It could be well over 10,000 miles off. They originally came with 27 -28 inch tires. Set your speedometer!! [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
J-Scan tire change broke speedometer and threw lots of codes
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