new tires..speeo off
 

97 wrangler, just put 31's (tires) on it. Speedo says 64 when actually
going about 70 now. Tire guy said may make 1-2 mile per hour difference,
but this is lots more! Any adjustment, or just get used to it?

thanks

cal

new tires..speeo off
 

Cal wrote:
> 97 wrangler, just put 31's (tires) on it. Speedo says 64 when
> actually going about 70 now. Tire guy said may make 1-2 mile per
> hour difference, but this is lots more! Any adjustment, or just get
> used to it?

You need a new gear on the speed sensor.
http://www.quadratec.com/products/pr...R&mn=MOPAR&c=5
among other sites.

--
DougW

new tires..speeo off
 

Generally Jeep speedometers get more accurate with larger tires.

How did you get your numbers?


"Cal" > wrote in message
m...
> 97 wrangler, just put 31's (tires) on it. Speedo says 64 when actually
> going about 70 now. Tire guy said may make 1-2 mile per hour difference,
> but this is lots more! Any adjustment, or just get used to it?
>
> thanks
>
> cal
>
>

new tires..speeo off
 

got my numbers by my son following me in his wrangler, me in my GC. I know
my speedo is about 1 mph off (in the GC) because of the radars that display
speed on the side of the road used by our local police. We compared our
speeds by cell phone. I know not the most accurate way to do this....

cal

"billy ray" > wrote in message
...
> Generally Jeep speedometers get more accurate with larger tires.
>
> How did you get your numbers?
>
>
> "Cal" > wrote in message
> m...
>> 97 wrangler, just put 31's (tires) on it. Speedo says 64 when actually
>> going about 70 now. Tire guy said may make 1-2 mile per hour difference,
>> but this is lots more! Any adjustment, or just get used to it?
>>
>> thanks
>>
>> cal
>>
>>
>
>

new tires..speeo off
 

Several gears to choose from....how do you determine which one you need?

cal

"DougW" > wrote in message
news:KK7Bg.67517$9c6.47028@dukeread11...
> Cal wrote:
>> 97 wrangler, just put 31's (tires) on it. Speedo says 64 when
>> actually going about 70 now. Tire guy said may make 1-2 mile per
>> hour difference, but this is lots more! Any adjustment, or just get
>> used to it?
>
> You need a new gear on the speed sensor.
> http://www.quadratec.com/products/pr...R&mn=MOPAR&c=5
> among other sites.
>
> --
> DougW
>
>
>
>

new tires..speeo off
 

Got any reasonably lightly travelled highways in the area? Run at
steady speed past 10 of the numbered markers along the highway using a
stopwatch for timing. Poor man's VASCAR. GPS would work as well.

Cal proclaimed:
> got my numbers by my son following me in his wrangler, me in my GC. I know
> my speedo is about 1 mph off (in the GC) because of the radars that display
> speed on the side of the road used by our local police. We compared our
> speeds by cell phone. I know not the most accurate way to do this....
>
> cal
>
> "billy ray" > wrote in message
> ...
>
>>Generally Jeep speedometers get more accurate with larger tires.
>>
>>How did you get your numbers?
>>
>>
>>"Cal" > wrote in message
. com...
>>
>>>97 wrangler, just put 31's (tires) on it. Speedo says 64 when actually
>>>going about 70 now. Tire guy said may make 1-2 mile per hour difference,
>>>but this is lots more! Any adjustment, or just get used to it?
>>>
>>>thanks
>>>
>>>cal
>>>
>>>
>>
>>
>
>

new tires..speeo off
 

http://www.raingler.com/tech/speedoChart.asp
God Bless America, Bill O|||||||O
http://www.billhughes.com/

Cal wrote:
>
> Several gears to choose from....how do you determine which one you need?
>
> cal

new tires..speeo off
 

Bill,
Thanks for the chart link! Looking at the chart, what is R&P? I understand
that the top grey line is the tire size (we used 31" tires.) But i don't
know what the R&P (the numbers in gray from top to bottom of chart?)
represents.
thanks for your help!

cal

"L.W.(Bill) Hughes III" > wrote in message
...
> http://www.raingler.com/tech/speedoChart.asp
> God Bless America, Bill O|||||||O
> http://www.billhughes.com/
>
> Cal wrote:
>>
>> Several gears to choose from....how do you determine which one you need?
>>
>> cal

new tires..speeo off
 

R&P = Ring and Pinion gear ratio. This is the gear ratio for the
differential. If you don't know what yours is, there should be a metal
tag under a couple of the cover bolts on the differential cover plate.

Art

Cal wrote:
> Bill,
> Thanks for the chart link! Looking at the chart, what is R&P? I understand
> that the top grey line is the tire size (we used 31" tires.) But i don't
> know what the R&P (the numbers in gray from top to bottom of chart?)
> represents.
> thanks for your help!
>
> cal
>
> "L.W.(Bill) Hughes III" > wrote in message
> ...
>> http://www.raingler.com/tech/speedoChart.asp
>> God Bless America, Bill O|||||||O
>> http://www.billhughes.com/
>>
>> Cal wrote:
>>> Several gears to choose from....how do you determine which one you need?
>>>
>>> cal
>
>

new tires..speeo off
 

R & P means ring and pinion, which is referring to your gear ratio.

Chris

"Cal" > wrote in message
m...
> Bill,
> Thanks for the chart link! Looking at the chart, what is R&P? I
> understand that the top grey line is the tire size (we used 31" tires.)
> But i don't know what the R&P (the numbers in gray from top to bottom of
> chart?) represents.
> thanks for your help!
>
> cal
>
> "L.W.(Bill) Hughes III" > wrote in message
> ...
>> http://www.raingler.com/tech/speedoChart.asp
>> God Bless America, Bill O|||||||O
>> http://www.billhughes.com/
>>
>> Cal wrote:
>>>
>>> Several gears to choose from....how do you determine which one you need?
>>>
>>> cal
>
>