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Jeep Wrangler JK
JK General Discussion
2015 Jeep JK overheating
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<blockquote data-quote="Dirty Dog" data-source="post: 463657" data-attributes="member: 24042"><p>For one thing, if you're running 37's with the stock gears, you're way off. If you've got a Rubicon you've got 4.10:1 gears. But since you've got a D30 in the front, it's not a Rubicon, which means you have (at best) a 3.73:1 gear. You need to be at 5.13:1 or, better yet, 5.38. </p><p>Your 222F engine temp is totally normal. But your engine is way out of the power band and working FAR too hard, so it's no surprise that mild slopes (which are all the interstates are allowed to have) causes it to overheat. The fact that you cannot use your overdrive gear is further evidence that your gearing is a mess. Shifting into 6th won't help because it means your gearing is even further off and the poor engine is working even harder.</p><p>Your thermostat could certainly have failed prematurely, but replacing it will not really help unless you fix the real problem.</p></blockquote><p></p>
[QUOTE="Dirty Dog, post: 463657, member: 24042"] For one thing, if you're running 37's with the stock gears, you're way off. If you've got a Rubicon you've got 4.10:1 gears. But since you've got a D30 in the front, it's not a Rubicon, which means you have (at best) a 3.73:1 gear. You need to be at 5.13:1 or, better yet, 5.38. Your 222F engine temp is totally normal. But your engine is way out of the power band and working FAR too hard, so it's no surprise that mild slopes (which are all the interstates are allowed to have) causes it to overheat. The fact that you cannot use your overdrive gear is further evidence that your gearing is a mess. Shifting into 6th won't help because it means your gearing is even further off and the poor engine is working even harder. Your thermostat could certainly have failed prematurely, but replacing it will not really help unless you fix the real problem. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
2015 Jeep JK overheating
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