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Power Strokes
6.4 Tech
speedo accuracy? self adjusting?
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[QUOTE="Corb@CorbinShipping, post: 105569, member: 2499"] ok, truck had 3.55s from factory. I put in 4.10s. I figured that I would be off a pretty descent amount, but no, it was still dead on. Registered within 1 MPH at 60, on my buddy's speedo calibration machine at his shop. So, I figured that it must have the speedo gears in the rear diff. Until, that is, I put new tires on.... not a huge difference, but i went from stock 275/65 r20, to a 325/60 r20. So, from 34.1 inch, to 35.4 inch tires. So, again, I figured that I would be off a bit, maybe a few MPH..... NOPE! still within 1 MPH at 60. I have never adjusted the speedo, on my tuner. either the spartan, or the H&S... So, I do have the NAV system from factory, on my 2010, is the speedo self adjusting through there? Or is my truck an alien life form? [/QUOTE]
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speedo accuracy? self adjusting?
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