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Jeep Wrangler YJ
YJ General Discussion
2.5L upgrade...
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<blockquote data-quote="machoheadgames" data-source="post: 433748" data-attributes="member: 18789"><p>the fact still is and always will remain that 3.07 gears suck. You killed what performance the 4.0 had by doing that….drive mine for comparison and comsidering 180 Hp & 220 tq, it’s relatively a bat out of hell. You are geared taller than any factory setup ever came. The 4.0 YJ came with 27’s and 28’s and the 28’s got 3.55. 3.07 on 31’s is terrible.</p><p></p><p>4.10 is a MUCH better match for 31’s with the AX15. That’s how the TJ Rubicon came factory and it was a great setup, well liked by many.</p><p></p><p>As for 4.0 vs 2.5, they are very similar besides engine mount location, fan shroud/hoses, and bellhousing and of course the exhaust and intake. But for engine management, you can buy stock harnesses and PCMs off eBay and make it plug and play….doesn’t have to be a hard swap. The benefit to 4.0 from a 2.5 is it has the OEM support. Any other V6 or V8 will require more custom work.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 433748, member: 18789"] the fact still is and always will remain that 3.07 gears suck. You killed what performance the 4.0 had by doing that….drive mine for comparison and comsidering 180 Hp & 220 tq, it’s relatively a bat out of hell. You are geared taller than any factory setup ever came. The 4.0 YJ came with 27’s and 28’s and the 28’s got 3.55. 3.07 on 31’s is terrible. 4.10 is a MUCH better match for 31’s with the AX15. That’s how the TJ Rubicon came factory and it was a great setup, well liked by many. As for 4.0 vs 2.5, they are very similar besides engine mount location, fan shroud/hoses, and bellhousing and of course the exhaust and intake. But for engine management, you can buy stock harnesses and PCMs off eBay and make it plug and play….doesn’t have to be a hard swap. The benefit to 4.0 from a 2.5 is it has the OEM support. Any other V6 or V8 will require more custom work. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
2.5L upgrade...
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