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Jeep Wrangler YJ
YJ General Discussion
YJ Rough Country 2.5 inch lift questions
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<blockquote data-quote="machoheadgames" data-source="post: 437685" data-attributes="member: 18789"><p>The transfer case drop lowers the transfer case output which changes the angle. It’s roughly a 2-3° change. The pinion needs to come up about that much to keep things parallel. If you want to be scientific about it, put an angle finder on the tcase before and after and buy leaf springs shims in the same amount that the tcase output changes.</p><p></p><p>For gear ratios, with your 4.0 you have either 3.07 or 3.55. Many manuals were 3.07, a few were 3.55. My 94 was 3.55, it was a base model SE and didn’t appear to have anything special (no tow hitch or anything) but it got the lucky gearing. With 31’s, both stock gearing options suck. I was frequently downshifting with 3.55 and 31’s from 5th gear. 3.07 would really suck on 31’s and even sucks on the stock 27’s.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 437685, member: 18789"] The transfer case drop lowers the transfer case output which changes the angle. It’s roughly a 2-3° change. The pinion needs to come up about that much to keep things parallel. If you want to be scientific about it, put an angle finder on the tcase before and after and buy leaf springs shims in the same amount that the tcase output changes. For gear ratios, with your 4.0 you have either 3.07 or 3.55. Many manuals were 3.07, a few were 3.55. My 94 was 3.55, it was a base model SE and didn’t appear to have anything special (no tow hitch or anything) but it got the lucky gearing. With 31’s, both stock gearing options suck. I was frequently downshifting with 3.55 and 31’s from 5th gear. 3.07 would really suck on 31’s and even sucks on the stock 27’s. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
YJ Rough Country 2.5 inch lift questions
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