Speedometer And Odometer

[thepretzelman]

So I just upgraded my tires from 30's to 33's and now my speedometer and odometer are off, how do I make them right?

 

[V8 Level II]

For 1998~2000, there were two systems:

• RABS trucks do the correction in the GEM (Generic Electronic Module)
• 4WABS trucks do the correction in the 4WABS Module

Either requires a dealer tool like an NGS or WDS to access the appropriate module and make the change.


A DIY alternative to the dealer adjustment is to install a speedo recalibration box:
http://www.bluegauges.com/prod_yellow_box.htm