you need a scantool that can access trhe inst. cluster so u can change the
pinion angle so it can be set tio the correct tire size ,you are also wasting
fuel

Cal wrote:

> Several gears to choose from....how do you determine which one you need?
>
> cal
>
> "DougW" <post.replies@invalid.address> 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
> >
> >
> >
> >

 

I would recommend you get a GPS or do a measured mile to see for sure.
My Jeeps speedos became accurate with larger tires. Tests against a
stock tire doesn't mean much for that reason.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

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?
>
> thanks
>
> cal

 

I would recommend you get a GPS or do a measured mile to see for sure.
My Jeeps speedos became accurate with larger tires. Tests against a
stock tire doesn't mean much for that reason.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

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?
>
> thanks
>
> cal

 

I would recommend you get a GPS or do a measured mile to see for sure.
My Jeeps speedos became accurate with larger tires. Tests against a
stock tire doesn't mean much for that reason.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

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?
>
> thanks
>
> cal

 

I would recommend you get a GPS or do a measured mile to see for sure.
My Jeeps speedos became accurate with larger tires. Tests against a
stock tire doesn't mean much for that reason.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

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?
>
> thanks
>
> cal

 

You need a new gear in your tcase.

Before you blow a gasket, the gear costs a few bucks, and you can put it in
yourself.



"Cal" <codom1*IHATESPAM*@triad.rr.com> wrote in message
news:iE7Bg.13246$4c7.12659@tornado.southeast.rr.co 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
>
>

 

You need a new gear in your tcase.

Before you blow a gasket, the gear costs a few bucks, and you can put it in
yourself.



"Cal" <codom1*IHATESPAM*@triad.rr.com> wrote in message
news:iE7Bg.13246$4c7.12659@tornado.southeast.rr.co 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
>
>

 

You need a new gear in your tcase.

Before you blow a gasket, the gear costs a few bucks, and you can put it in
yourself.



"Cal" <codom1*IHATESPAM*@triad.rr.com> wrote in message
news:iE7Bg.13246$4c7.12659@tornado.southeast.rr.co 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
>
>

 

You need a new gear in your tcase.

Before you blow a gasket, the gear costs a few bucks, and you can put it in
yourself.



"Cal" <codom1*IHATESPAM*@triad.rr.com> wrote in message
news:iE7Bg.13246$4c7.12659@tornado.southeast.rr.co 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
>
>

 

"Cal" <codom1*IHATESPAM*@triad.rr.com> wrote in message
news:9huBg.102863$R26.6840@tornado.southeast.rr.co m...
> Bill,
> Thanks for the chart link! Looking at the chart, what is R&P?

Ring & Pinion.




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!
>

You have 3.07s or 3.73s. Well, if you have a 4 cyl, you have 4.10s.