Speedo change going from 33s to 37s? calibrates speedometer!

[yrwins]

I about to install Mopar 2" lift and Daystar 3/4" Comfort Ride Spacer.
so I going from 33 to 37.
how to calibrates speedometer.

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[Quack]

Dealer, Tazer or JScan

 

[Idlethunder]

I used jscan before buying a Tazer. Both worked perfectly but since the Tazer stays connected now, I use it when I swap back and forth to the tires I use for towing.

If you use JScan, you’ll need the app and a license that cost around $20. A Bluetooth OBD adapter from the JScan supported adapter list: https://jscan.net/supported-and-not-supported-obd-adapters/

And a bypass cable like this: https://www.amazon.com/gp/product/B082Y918Z3/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

It Is also a good idea to by an extension cable to keep from tearing your hands up if you need to use it more than once: https://www.zautomotive.com/product/z_sgw_ext/

 

[DiehardTory]

Jscan.net Not as costly and not left in the OBD port once you effect your changes.. Check Jscan on Facebook to for many tips on use.

 

[Greg_L]

I use an ECRI. You buy it once and can use it on multiple vehicles for a fee per vehicle but then it's yours forever. I went that route because we have multiple Jeeps.

 

[Trollboogie]

I second the ECRI. You can use the GPS speedo calibration function. I have both a Tazer( wife's JL ) and an ECRI. I prefer the ECRI. I don't really need the live functions of the Tazer.

 

[Riverdog]

I just did mine with jscan, turns out I didn't even need the extensions everyone else talked about (I think the bypass is harder to reach if you have adaptive cruise control -which I don't) but it was the cheapest option, very easy and can be used on multiple jeeps (purchase each VIN for like $25)

 

[djthumper]

Considering you had to ask instead of a quick search... Go to the dealer, then you don't have to learn how to do it.

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