No, the Rubicon has no way to self-calibrate its own speedometer. The
dealer must reflash the computer but I don't think they have a way to
reflash for any tire as large as 35".

And the Rubicon's performance with its 4.10 axle ratio with 35" tires
and the 5-speed or 6-speed tranny would absolutely suck big-time.
Performance would not be so bad with that combination if it had an
automatic though.

Jerry

L.W.(ßill) ------ III wrote:
> Someone in this group said the Rubicon automatically recalibrates
> speedometer for tire size, like it may have an axle height sensor.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Rich wrote:
>
>>I've got a neighbor who has a Rubi. 2005 I think. He's getting ready to lift
>>it and put 35" tires on without a gear change. (not a choice I'd make but
>>non-the less). He's wondering what he can do to recalibrate the Speedo
>>without going to the stealership. I'd know what to do if he had a CJ. My
>>guess is he needs a computer reprogramming. True?
>>Thanks
>>Rich

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

That is the combo I'm currently using. While not ideal, I'm not a rock
crawler so with the auto trans it is satifactory. There has been nothing
that 4LO didn't get me out of.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________

Jerry Bransford wrote:
> No, the Rubicon has no way to self-calibrate its own speedometer. The
> dealer must reflash the computer but I don't think they have a way to
> reflash for any tire as large as 35".
>
> And the Rubicon's performance with its 4.10 axle ratio with 35" tires
> and the 5-speed or 6-speed tranny would absolutely suck big-time.
> Performance would not be so bad with that combination if it had an
> automatic though.
>
> Jerry

 

That is the combo I'm currently using. While not ideal, I'm not a rock
crawler so with the auto trans it is satifactory. There has been nothing
that 4LO didn't get me out of.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________

Jerry Bransford wrote:
> No, the Rubicon has no way to self-calibrate its own speedometer. The
> dealer must reflash the computer but I don't think they have a way to
> reflash for any tire as large as 35".
>
> And the Rubicon's performance with its 4.10 axle ratio with 35" tires
> and the 5-speed or 6-speed tranny would absolutely suck big-time.
> Performance would not be so bad with that combination if it had an
> automatic though.
>
> Jerry

 

That is the combo I'm currently using. While not ideal, I'm not a rock
crawler so with the auto trans it is satifactory. There has been nothing
that 4LO didn't get me out of.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________

Jerry Bransford wrote:
> No, the Rubicon has no way to self-calibrate its own speedometer. The
> dealer must reflash the computer but I don't think they have a way to
> reflash for any tire as large as 35".
>
> And the Rubicon's performance with its 4.10 axle ratio with 35" tires
> and the 5-speed or 6-speed tranny would absolutely suck big-time.
> Performance would not be so bad with that combination if it had an
> automatic though.
>
> Jerry

 

That is the combo I'm currently using. While not ideal, I'm not a rock
crawler so with the auto trans it is satifactory. There has been nothing
that 4LO didn't get me out of.

tw
__________________________________________________ ___________________
2003 TJ Rubicon * 2001 XJ Sport * 1971 Bill Stroppe Baja Bronco

"There is a very fine line between 'hobby' and 'mental illness'."

Pronunciation: 'jEp Function: noun Date: 1940

Etymology: from g. p. (G= 'Government' P= '80 inch wheelbase')
A small general-purpose motor vehicle with 80" wheelbase, 1/4-ton
capacity and four-wheel drive used by the U.S. army in World War II.
__________________________________________________ ___________________

Jerry Bransford wrote:
> No, the Rubicon has no way to self-calibrate its own speedometer. The
> dealer must reflash the computer but I don't think they have a way to
> reflash for any tire as large as 35".
>
> And the Rubicon's performance with its 4.10 axle ratio with 35" tires
> and the 5-speed or 6-speed tranny would absolutely suck big-time.
> Performance would not be so bad with that combination if it had an
> automatic though.
>
> Jerry

 

i have 456 with 35's and bought a new speedo gear at the dealer it was only
10 bucks



"Rich" <harrisfam1988@verizon.net> wrote in message
news:XwIPf.1602$ky1.188@trndny06...
> I've got a neighbor who has a Rubi. 2005 I think. He's getting ready to
lift
> it and put 35" tires on without a gear change. (not a choice I'd make but
> non-the less). He's wondering what he can do to recalibrate the Speedo
> without going to the stealership. I'd know what to do if he had a CJ. My
> guess is he needs a computer reprogramming. True?
> Thanks
> Rich
>
>

 

i have 456 with 35's and bought a new speedo gear at the dealer it was only
10 bucks



"Rich" <harrisfam1988@verizon.net> wrote in message
news:XwIPf.1602$ky1.188@trndny06...
> I've got a neighbor who has a Rubi. 2005 I think. He's getting ready to
lift
> it and put 35" tires on without a gear change. (not a choice I'd make but
> non-the less). He's wondering what he can do to recalibrate the Speedo
> without going to the stealership. I'd know what to do if he had a CJ. My
> guess is he needs a computer reprogramming. True?
> Thanks
> Rich
>
>

 

i have 456 with 35's and bought a new speedo gear at the dealer it was only
10 bucks



"Rich" <harrisfam1988@verizon.net> wrote in message
news:XwIPf.1602$ky1.188@trndny06...
> I've got a neighbor who has a Rubi. 2005 I think. He's getting ready to
lift
> it and put 35" tires on without a gear change. (not a choice I'd make but
> non-the less). He's wondering what he can do to recalibrate the Speedo
> without going to the stealership. I'd know what to do if he had a CJ. My
> guess is he needs a computer reprogramming. True?
> Thanks
> Rich
>
>

 

i have 456 with 35's and bought a new speedo gear at the dealer it was only
10 bucks



"Rich" <harrisfam1988@verizon.net> wrote in message
news:XwIPf.1602$ky1.188@trndny06...
> I've got a neighbor who has a Rubi. 2005 I think. He's getting ready to
lift
> it and put 35" tires on without a gear change. (not a choice I'd make but
> non-the less). He's wondering what he can do to recalibrate the Speedo
> without going to the stealership. I'd know what to do if he had a CJ. My
> guess is he needs a computer reprogramming. True?
> Thanks
> Rich
>
>

 

Yep but again, that won't work with a Rubicon that does not use a
speedometer gear.

J. Sprauer wrote:
> i have 456 with 35's and bought a new speedo gear at the dealer it was only
> 10 bucks
>
>
>
> "Rich" <harrisfam1988@verizon.net> wrote in message
> news:XwIPf.1602$ky1.188@trndny06...
>
>>I've got a neighbor who has a Rubi. 2005 I think. He's getting ready to
>
> lift
>
>>it and put 35" tires on without a gear change. (not a choice I'd make but
>>non-the less). He's wondering what he can do to recalibrate the Speedo
>>without going to the stealership. I'd know what to do if he had a CJ. My
>>guess is he needs a computer reprogramming. True?
>>Thanks
>>Rich
>>
>>
>
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/