Speedometer

[Thunderdawg]

I just put some 33 inch MT tires on my 2019 ram 1500 with 3.21 ratio axels and my speedometer is off. Starts off 1 mph off around 30 to 40 mph and the higher I go it’ll go to 2 mph off. So when I’m going 70 mph I’m really going 72 mph. And I’m Curious if my mph economy gage is off by 1 or 2 mph also. If I recalibrate the speedometer will it fix the issue?

 

[DakotaRam]

Speedometer calibration

Well, two dealers and two local garages cannot calibrate the speedometer. Since I increased tire size to 275 60-R20 my speedometer reads approximately 3 mph faster than stated on speedometer. Actually 2,270 mph. Anyhow nobody seems to be able to adjust for tire size. One Ram dealers tech said a...

5thgenrams.com

 

[Bearman95]

I used a taser DT to re-calibrate my Speedometer. I had to use a setting of 33.37 I believe to get it exactly correct. I have 275/60/20 tires which are 33 inch tires.

 

[TheBattman]

Speedometer calibration

Well, two dealers and two local garages cannot calibrate the speedometer. Since I increased tire size to 275 60-R20 my speedometer reads approximately 3 mph faster than stated on speedometer. Actually 2,270 mph. Anyhow nobody seems to be able to adjust for tire size. One Ram dealers tech said a...

5thgenrams.com

That post is a 4th gen...