Speedometer gear selection

blown motor · September 13, 2019, 07:41:03 AM

The speedometer on my Charger is very much inaccurate. Tire size is 275/40/17 which is 26.7" diameter and the rear end has 3.55 gears. Based on the attached chart the 26"/3.55 gear is 36 tooth and the 28"/3.55 gear is the 33 tooth. So I figure the 35 tooth should be about perfect for a 26.7" tire. Agree or disagree?

http://www.mymopar.com/speedometer.htm

Burdar · September 13, 2019, 07:45:03 AM

There are a few different charts out there. This one shows a 34 tooth gear for a 27" tall tire and 3.55 gears.
https://www.forabodiesonly.com/mopar/threads/speedo-gear-calculator.403669/

dodj · September 13, 2019, 07:47:49 AM

Sounds good to me.

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