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Dex
Dodge Dakota
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5/06/2006
14:54:56
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 Subject: 3.55 to 4.10 Gears & Odometer reading
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Message:
I just swapped out my 3.55 to 4.10 gears so I can tow a bit more.
I know the speedometer is not giving me the correct reading.
Is the odometer also off? or is that reading taken from another area so that it isn't off.
If it is off does anyone know a formula to calculate the correct odometer reading?
I want to calculate my mpg.
I have the formula for the correct speedometer reading as:
Actual speed = (Old gear Ration/New Gear Ratios) X speedometer reading
Thanks
2000 Quad Cab 4X4-Sport V-6 Automatic Sports Plus Package
31X10.5 tires, Limited Slip, 4.1 Gears, Trailer Tow Group, HD Package, Skid Plates, LineX Spray in bed liner; Added:Airaid air filter & heat shield, Flowmaster 3 chamber muffler, Steel Horse Torneau cover, front hitch, Autolite Double Platinum 3923 Plugs, Removed air horns from Throttle Boddy, added new TB bolts, Cool Tape around air filter and A/C tubes, Amsoil in: crank case, differential and tranfercase.
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Scott C
Dodge Dakota
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5/06/2006
22:25:11
| RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
your speedo and odo are going to be off..... there is a programmer that you can use that will go into the computer and change the gear ratio do that the speedo and odometet will read correctly.... or you can go to your local dodge dealer and see if they can flash it for you
Scott C
Royal Auto
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TexasTodd
Dodge Dakota
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5/07/2006
03:06:32
| RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
Thats funny, changing the gears on my 01, dak, doesn't change the speedo/odo, only a tire size change will do that.
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Dex
Dodge Dakota
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5/07/2006
11:49:33
| RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
TexasTodd
You know, when I'm driving on the highway with an actual reading of 65mph I'm flowing with the traffic.
The gear change formula says I'm actually traveling at 56mph!?
Maybe I don't have to change my odometer reading.
Is there a way to find out?
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chris
Dodge Dakota
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5/07/2006
14:30:20
| RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
depending on the year of your dak the speed sensor was placed so only changing your tires size will affect your speedomiter
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SinCity R/T
Dodge Dakota
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5/11/2006
13:36:43
| RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
Changing gears does not affect the speedometer of 97-04 Dakotas/Durangos, only changing the tire diameter.
SinCity R/T
2003 Black Dakota R/T
2003 White Dakota R/T
http://www.dakota-durango.com
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Kowalski
GenIII
5/11/2006
16:24:42
|  RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
Yup, Dex - your speedo is reading correctly.
Lead, follow, or get out of the way
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bbcdon
Dodge Dakota
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5/15/2006
09:16:18
| RE: 3.55 to 4.10 Gears & Odometer reading
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Message:
Is it the same for a 06 dakota, as far as sensing just the tire size? Thanks, Don.
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