I swapped diffs in my 2001 Kenworth T800 and changed the gear ratio. Went from 3.90 to 3.36 and the shop I park the truck has a Matco scanner which we did successfully change it in the ECM, so my scangauge on the dash shows the correct speed... However my speedo is not correct. How do you figure out how to set the dip switches on the back of it? I just want my odometer to be accurate.
Thanks.
2001 T800 Gear swap - how to change speedo?
Discussion in 'Kenworth Forum' started by Green461, Jul 27, 2026.
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