Again, see the link here - it clearly states the answer to your question.

https://transmissioncenter.net/shop/...dometer-gears/

 

Awesome thanks! The previous link did not show tires over 30".

 

Looks like a 37 tooth...


R&P / Tire 38″ 37″ 36″ 35″ 33″ 32″ 31″ 30″
5.13 38 39 40 41 43 45 46 48
4.88 36 37 38 39 41 43 44 46
4.56 34 35 36 37 39 40 42 43
4.11 31 32 33 34 36 37 38 40
3.73 27 28 28 29 31 32 33 34
3.55 – – – – 31 31 32 33



Sorry, it didn't cut-and-paste right.

 

Easiest way to do it is to take the original speedo gear out and see how many teeth it has. From there it's just a ratio between your indicated speed vs. GPS at any given time (highway for example), so

(new speedo gear teeth #) = (indicated speed) / (GPS speed) x (old speedo gear teeth #)

For me I went from 3.55 to 4.56, stock tires to 35". 30 tooth stocker and a 36 tooth replacement is dead nuts on. These ratio charts will screw you up more than anything.

 

Found a chart here: 4.56 gears, and 35 inch tires looks like 37 tooth gear.

 

Hey, that's what I said!

 

I have no clue why I didn't see that...... I am going to chalk it up to being before my first cup of coffee....