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speedometer correction
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Posted: 10/07/09
10:27 AM
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84 k20 burb, th400, np208c, 4.46 gears,34.60 tire height, 15 tooth drive, 36 tooth driven, went thru a speed zone that tells you how fast your going. and when i was doing 25 my speedo reads 32 so can i just change the gear on the cable or do i need to change the one on output shaft. tried a site to calculate which gear i need it came up with 39 tooth driven . but i need to know for sure.cant afford trial and error
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ftgiles
User
| Posts: 54
| Joined: 05/08
Posted: 10/07/09
07:26 PM
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The most accurate way to measure your tire height so that your calculations are more accurate is to measure from the ground up to the center of the wheel. This gives you the radius. Then multiply by two. This gives you the diameter.
The weight of the truck makes the tire bulge which reduces the "effective radius".
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04-Z71
Guru
| Posts: 1026
| Joined: 09/08
Posted: 10/08/09
06:45 AM
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you can also go on the manufactures website and it will give you height and RPMs for the tire
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