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  #1  
Old 01-01-2012, 06:50 AM
JSBake7 JSBake7 is offline
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Default New tires, time to adjust speedometer ?

Happy 2012 everybody, hope you're all doing well

Just put a readylift leveling kit on my '09 Laramie and added some 285/65R20 BFG AT's to the stock wheels (merry Xmass to me, by the way). Pictures to follow soon!

Now, of course, due to the change in tire circumference things like the odometer and speedometer are incorrect. Is there a cheap & easy way to fix this?

I normally wouldn't care, but my state (NC) requires an annual safety and emissions inspection, and I'm afraid it might include a check for accurate gages. I don't want to find out at the local inspection station that it must be fixed before I can renew my registration, and that he would be happy to fix it for me for a ridiculous price!

Thanks!
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Old 01-01-2012, 07:04 AM
JSBake7 JSBake7 is offline
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So I found this website with a hand speedometer adjustment calculator...

http://www.csgnetwork.com/speedocalibcalc.html

Looks like for my change in tire size, I'm going 1 moh faster for every 20 mph. So if my gauge says I'm doing 60, I'm really doing about 63. No biggie, and I'm. Betting NC won't care either

John
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Old 01-01-2012, 07:22 AM
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You can pick up a handheld programer like a diablo or a superchip, they have the ability to adjust for different tire seizes. Any dealership or speed shop can also flash the computer with the new tire spec easily enough. The programmers are better options because you can also have all the features, like octane tunes, code reader/clearing, etc.
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Old 01-01-2012, 11:17 AM
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The 4th gen trucks only have the peramiters to change the tires sizes between the two stock heights. You will need a programer that has that function. Aslo remeber , if your speedo is off , then your heads up MPG reading will be off also.
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Old 02-09-2012, 10:37 PM
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4wheelparts sells a Truspeed Speed Sensor Recalibrator. $229
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Old 02-10-2012, 12:08 AM
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Quote:
Originally Posted by CountryD View Post
4wheelparts sells a Truspeed Speed Sensor Recalibrator. $229
Diablosport predator is going for $270 on ebay...does the same thing as the Truspeed....except a lot more....
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Old 02-10-2012, 12:50 AM
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Not for the 2011-2012. Your stuck for now. I have been waiting a while for one to come out. The older ones for the 2009-2010 could not work for the newer Rams.

You can follow updats on programmer here.

http://diablosport.com/index.php?nam...r=asc&start=60
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Old 02-10-2012, 02:27 AM
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Quote:
Originally Posted by Mad Cow View Post
Not for the 2011-2012. Your stuck for now. I have been waiting a while for one to come out. The older ones for the 2009-2010 could not work for the newer Rams.

You can follow updats on programmer here.

http://diablosport.com/index.php?nam...r=asc&start=60

The O.P has an 09.
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Old 02-10-2012, 08:49 AM
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I have a bully dog in my 09, it can recal your spreedo but it was a pain, it gives you the tire size your running, and even tho you choose the correct one it wont be right, you have to keep playing with it to dial it in. I gave up lol
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Old 02-10-2012, 09:52 AM
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I second getting a tuner
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