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I have a buddy with a 2008 4 door with 4/88 gears and 37's. I know he needs the 37 tooth speedo gear but I don't know if he needs the short or long gear. How do I tell so I don't order the wrong one? Thanks.
 

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With the JK you can simply order the AEV ProCal and reprogram your speedo (and other things) right through your OBD port. They're $150, and can be used over and over should he ever change tire sizes/gear ratio/etc. again.

This also allows you to fine tune your speedo by playing around with different sizes to see what turns up as the most accurate.
 
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