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  #11  
Old 02-10-2012, 07:14 PM
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Quote:
Originally Posted by 337ram View Post
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
I had the same problem with my DS. I just set it to what tire size I have (35") then hit the highway and checked the accuracy with GPS on my phone. It was off so I changed it until my speedo reflected the same MPH as my GPS. I ended up settling on 33.5" tall tires on my tuner.
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Old 02-10-2012, 09:08 PM
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Programmes don't take into consideration height lost due to air pressure and load, they will give you true height readings. True height is usually about an inch (give or take a little) shorter then tire size indicates once you put the weight of the truck on it.
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Old 02-10-2012, 09:09 PM
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I called and talked to the dealer today, and he told me that they can adjust your speedometer up to 285 tires. Said all they would have to do is hook it up and it would recalibrate it.
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