[lobolito]

12 2500 running 35s and 3.73. My speedometer reads around 5mph fast. Will this effect what my odometer reads?

 

[cumminthanstrockin]

Yes


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[lobolito]

Yes


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Haha, Ok....Good talk....So I pretty much have to get a tuner to fix the issue ya?

 

[Jimmy07]

You have 35’s with an uncorrected speedometer, I assume? Do you mean to say that you are traveling 5mph faster than what the speedometer shows? If so, that’s about normal for the size of your tires with an uncorrected speedo. If you’re speedometer is reading 5mph faster than you are actually traveling, then there’s a problem.
Either way, both situations affect the odometer.

 

[Wylie-Cummins]

Borrow a bully dog from somebody and just reset the tire size. Simple fix

 

[lobolito]

You have 35’s with an uncorrected speedometer, I assume? Do you mean to say that you are traveling 5mph faster than what the speedometer shows? If so, that’s about normal for the size of your tires with an uncorrected speedo. If you’re speedometer is reading 5mph faster than you are actually traveling, then there’s a problem.
Either way, both situations affect the odometer.

From my understanding, with larger tires the speedo should be reading slower than what I am actually traveling. But my speedo is reading faster than what I am actually traveling. So when my GPS says that I am doing 60 mph, my speedo is reading 65 mph. What kind of problems could this be indicating?

 

[lobolito]

Borrow a bully dog from somebody and just reset the tire size. Simple fix

Im only 2 and half hours south of you, got a bully dog I can borrow?:wink2:

 

[Pufferman]

My xrt pro can do that too. I'm 2 hours south of you. LULZ

 

[Jimmy07]

From my understanding, with larger tires the speedo should be reading slower than what I am actually traveling. But my speedo is reading faster than what I am actually traveling. So when my GPS says that I am doing 60 mph, my speedo is reading 65 mph. What kind of problems could this be indicating?

Does it show 5mph faster no matter what speed you are going?
Was it reading correctly before you got 35’s?

 

[lobolito]

Does it show 5mph faster no matter what speed you are going?
Was it reading correctly before you got 35’s?

Ya, its pretty consistent 5mph faster across the board

 

[lobolito]

My xrt pro can do that too. I'm 2 hours south of you. LULZ

Nice, I frequent the bay area more than I do DFW. Got family in Brazoria county. Yall got hit with a bunch of rain again here pretty recently ya? Whats the conditions like down there?

 

[Jimmy07]

I would say it’s a problem with the speedometer dial itself. And, yes, that is directly related to how many miles the odometer picks up.

 

[lobolito]

I would say it’s a problem with the speedometer dial itself. And, yes, that is directly related to how many miles the odometer picks up.

So I may have to replace my transmission speed sensor? Im not throwing any codes so I might try and get with one of my buddies with a bully dog and reset it that way first then go from there. Thank for all the help bud!

 

[Jimmy07]

So I may have to replace my transmission speed sensor? Im not throwing any codes so I might try and get with one of my buddies with a bully dog and reset it that way first then go from there. Thank for all the help bud!

No. The speedometer picks up its signal from the wheel speed. I don’t think it’s a sensor issue because they would have to all go bad to do that. If only one was bad, you would get a Uxxx fault saying something like “implausible wheel speed...”. I think it’s just the actual speedo needle itself.
I say correct your speedometer for your tire size first, and go from there.

 

[Pufferman]

Nice, I frequent the bay area more than I do DFW. Got family in Brazoria county. Yall got hit with a bunch of rain again here pretty recently ya? Whats the conditions like down there?

just a water spat. dry now. It was mostly down town H area that flooded.

 

[Pufferman]

with 35's you're about 10% off.

 

[Wylie-Cummins]

Im only 2 and half hours south of you, got a bully dog I can borrow?:wink2:

I actually do have one you can borrow. Come on over and we will get you fixed up.

 

[Grit dog]

Ya, its pretty consistent 5mph faster across the board

Fix that issue before trying to correct for tire size.
Personally I wouldn't worry about correcting for tire size with only 35s. And, I'm sure the newer Bully Dog Tuners are better, but my old PowerPup tuner on the 07 will screw up the truck if you try to adjust tire size. I'd consult BD first if you're using a BD tuner. The tech there (after he re-flashed the truck/tuner) told me to never touch the tire size button again! FWIW