Speedometer correction?
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Senior User
Joined: Feb 2005
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From: Eastern, NC
Speedometer correction?
Ok, I am having a lot of work done to my truck and I want it right the first time. I am adding a 7" Icon lift w/ 37" tires 4.30 gears and was planning to add the superlift tru-speed. I am being told by the shop that I do not need a truspeed since I am also about to order an X-cal 3 from one of the tuners (spartan, innovative etc). Do I need the tru-speed or not? I was under the impression that the SCT does not recalibrate the speedo. Thanks for your help, Ray
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Joined: May 2006
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From: Central Florida
On an 05 you should be good to adjust the speedo with 37's. You will need to tell the tuner that you have that tire size and all other mods you have done. Where the tru-speed would be handy is if you change tire sizes (or you could just have tunes for the different tire sizes.)
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Joined: Feb 2006
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Originally Posted by Green Ford
I have the TruSpeed on mine because of tire and gear changes. It is perfect now.
I have heard elsewhere the SCT does not correct for tire size.
I use a speed wizard on mine, 2 trouble free years and I have had (exact measurements : 36.5", 35.5" 31.7" tires (the last one is stock). Once setup my garmin GPS matches the speed quite well.
Kenny
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