2003 Jeep Wrangler - Speedo Change

[HellKnightHicks]

This is a lifted 2003 Wrangler
4.88 Gears
32" tires

I only see

Final Drive
-Factor Max 104
-Factor Min 68

Do I just log VSS and see how many ticks per mile?

Speedo Says 80 Actual Speed about 72 or so

Thanks

[bkcalhoun]

I have the same 2003 Jeep Wrangler. I have the same question. I see the same Final Drive : Factor MAX and Factor MIN values.
I Don't want to purchase credits for this vehicle without knowing if I can change the Speedo.

Thanks

[LilSick]

5.14.png

3.91 gear and 85" of rollout (47re trans)

[mlmf]

You need to change the speedometer gear in the transfer case.
Refer to the chart located here.
https://www.extremeterrain.com/wrang...ear-chart.html

[Quebec4x4]

Well, the speedo gear change is a solution, but how work the tool in HPtuner ? how to calibrate it by the tool ?

thanks

[bkcalhoun]

5.14.png

3.91 gear and 85" of rollout (47re trans)

Thanks for your reply.
Can you elaborate please.
Is this an example of a working speedo adjustment?
If it is, how did you arrive at these calculations?

[PSYKOSTEVO]

Most likely not a custom value that person used. I show those same numbers are they do on my 2004 Grand Cherokee as the stock values.

[LilSick]

Just saw your question. They were stock values. My truck isn?t 4x4 so it doesn?t have high and low range. Yours does tho so any adjustment will have to be in the transfer case or the BCM as your transmission does not know which range is selected or what the actual driveshaft speed is