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speedo calibration

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Old Feb 4, 2014 | 04:33 PM
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speedo calibration

OK, I used the numbers from another thread for my speedo and I still am not close . Any thoughts , suggestions? I just don't want to use up all of the changes in the PSOM.
 
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Old Feb 4, 2014 | 06:18 PM
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Without any details of your truck, we really can't help you....

What tire size and axle ratio are you running?
 
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Old Feb 5, 2014 | 04:52 PM
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285-75-16 tires , 4.10's. I used one chart that gave me a 9.41 constant and I think that made the speedo faster. I found another chart that gives me a 9.21 constant. I was wondering what numbers others were using.
 
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Old Feb 5, 2014 | 07:18 PM
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Any light you can shed would be helpful. Im going to have to do this in the future since i am jumping up to 285s as well
 
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Old Feb 5, 2014 | 08:59 PM
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I hope I can get some info to make a guess. The speedo was pretty close with the 285's but since we changed the PSOM , we're about 10MPH off.
 
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