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Jeep Wrangler YJ
YJ General Discussion
31" or 30" tires?
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<blockquote data-quote="smgager" data-source="post: 427778" data-attributes="member: 19275"><p>[URL unfurl="true"]http://www.grimmjeeper.com/gears.html[/URL]</p><p></p><p>Here is a good gear calculator. I went with 4.56 for my 2.5L with 31s and I'm happy. I live on the North Carolina coast so the closest I come to a hill is going over a bridge. I can run at 70 on the HWY at around 3,000 RPM.</p><p></p><p>If you need the information to setup the form the stock YJ 2.5L with a 5 speed came an AX5 transmission with a NP231 transfer case and 27 inch tires. I am happy with my choice but if I had it to do again I would go with 4.88 for a little more pep. None of the speedometer gear charts I've seen have a gear for 4.88s on 31s so your speedo might be off when you are done.</p></blockquote><p></p>
[QUOTE="smgager, post: 427778, member: 19275"] [URL unfurl="true"]http://www.grimmjeeper.com/gears.html[/URL] Here is a good gear calculator. I went with 4.56 for my 2.5L with 31s and I'm happy. I live on the North Carolina coast so the closest I come to a hill is going over a bridge. I can run at 70 on the HWY at around 3,000 RPM. If you need the information to setup the form the stock YJ 2.5L with a 5 speed came an AX5 transmission with a NP231 transfer case and 27 inch tires. I am happy with my choice but if I had it to do again I would go with 4.88 for a little more pep. None of the speedometer gear charts I've seen have a gear for 4.88s on 31s so your speedo might be off when you are done. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
31" or 30" tires?
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