Need some help selecting a speedo gear part #

[brian4.2]

On one of my TJs I am running the Rubicon 31" tires, I have geared it to 4:56 using a stock 231. cant seem to find a chart for a Part#, but I do know how to change them.

Thanks and see you all soon enough. Brian

[Old Fart]

39 tooth according to this:

http://www.jeeptech.com/javaAps/Speedo.html

[Jerry Bransford]

Though this conflicts substantially with the above 39 tooth recommendation, I recommend you use a 42 tooth gear per http://www.raingler.com/tech/speedoChart.asp. Most of the speedo gear recommendations at Raingler are GPS verified and are are generally right on the money

That calculator in the above recommendation at http://www.jeeptech.com/javaAps/Speedo.html seems to have a bug in it. Most of the time I used to consult that calculator, its recommendations were usually off.