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Jeep Wrangler JK
JK General Discussion
Purchased my first jeep. Overheating cats with p0016 code
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<blockquote data-quote="Vman" data-source="post: 443710" data-attributes="member: 22091"><p>Sorry to hear they had to pull out the rib spreader for you but thanks for the follow up. </p><p></p><p>Where did you order the replacement engine from if you don't mind me asking?</p><p></p><p>You've got two issues with 37's on a 3.8: the D30 and the 42RLE 4 speed auto. </p><p></p><p>You can get 5.38 gears for the D30. No experience on how they'd hold up. That will be the minimum gear ratio for 37's and the max that the D30 can use.</p><p></p><p>I faced the same issue on my '07 and elected to go with 35's and 5.13's and it turned out to be the right decision. I didn't think the transmission would last long running 37's, especially when the 07-11 doesn't have the transmission coolers that the 12+ models have from the factory. Looks like you got that figured out though as I see it in your list of replacement parts.</p><p></p><p>That said, I didn't actually put on the 37's, so I have no experience with that. Figured I'd stick with the 35's, upgrade the axles down the line, and would have a set of 5.13 axles I'd have no problem selling to help with the upgrade.</p><p></p><p>The chart in the link below I can say is 100% accurate for the 3.8 on 35's with 5.13 gears, so is a good place to help figure things out.</p><p></p><p>5.38's on 37's would put you at about the same RPM's I'm seeing with 35's on 5.13's according to the chart.</p><p></p><p>[URL unfurl="true"]https://prodigyperformance.com/blog/jeep-wrangler-gear-ratio-calculator/[/URL]</p></blockquote><p></p>
[QUOTE="Vman, post: 443710, member: 22091"] Sorry to hear they had to pull out the rib spreader for you but thanks for the follow up. Where did you order the replacement engine from if you don't mind me asking? You've got two issues with 37's on a 3.8: the D30 and the 42RLE 4 speed auto. You can get 5.38 gears for the D30. No experience on how they'd hold up. That will be the minimum gear ratio for 37's and the max that the D30 can use. I faced the same issue on my '07 and elected to go with 35's and 5.13's and it turned out to be the right decision. I didn't think the transmission would last long running 37's, especially when the 07-11 doesn't have the transmission coolers that the 12+ models have from the factory. Looks like you got that figured out though as I see it in your list of replacement parts. That said, I didn't actually put on the 37's, so I have no experience with that. Figured I'd stick with the 35's, upgrade the axles down the line, and would have a set of 5.13 axles I'd have no problem selling to help with the upgrade. The chart in the link below I can say is 100% accurate for the 3.8 on 35's with 5.13 gears, so is a good place to help figure things out. 5.38's on 37's would put you at about the same RPM's I'm seeing with 35's on 5.13's according to the chart. [URL unfurl="true"]https://prodigyperformance.com/blog/jeep-wrangler-gear-ratio-calculator/[/URL] [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Purchased my first jeep. Overheating cats with p0016 code
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