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Jeep Wrangler JK
JK Build Threads & Member's Rides
JK high school build
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<blockquote data-quote="Dirty Dog" data-source="post: 459331" data-attributes="member: 24042"><p>People say a lot of things. Not all are true, and some of what is true is irrelevant in the real world.</p><p></p><p>The argument is that lower (numerically higher) gears have more teeth in the same space, therefore they have to be thinner. OK, that's fine as far as it goes. But it ignores the fact that the same change in tooth size means the ring and pinion gears will engage more deeply, resulting in a larger contact patch.</p><p></p><p>It also ignores the fact that your Jeep doesn't exactly make a lot of power...</p><p></p><p>My YJ had 5.13 gears in a D44 and Chevy 12 bolt with lockers and beadlocked 40" Bias Super Swamper IROK rubber. Being spun by a 400HP EFI 383ci Chevy through a turbo 350 and Atlas 4 speed. Even with a 10:1 crawl range, and all the torque multiplication that implies, I never broke the differential gears. Plenty of other parts, but not the ring & pinion.</p><p></p><p>But I'm going to text one of my kids. I've posted his credentials elsewhere, but the short version is an engineering PhD and a job crashing and/or blowing up trains and finding ways to make them safer. Currently working on the Hyperloop project. I'll ask him for a definitive answer and post it when he replies.</p></blockquote><p></p>
[QUOTE="Dirty Dog, post: 459331, member: 24042"] People say a lot of things. Not all are true, and some of what is true is irrelevant in the real world. The argument is that lower (numerically higher) gears have more teeth in the same space, therefore they have to be thinner. OK, that's fine as far as it goes. But it ignores the fact that the same change in tooth size means the ring and pinion gears will engage more deeply, resulting in a larger contact patch. It also ignores the fact that your Jeep doesn't exactly make a lot of power... My YJ had 5.13 gears in a D44 and Chevy 12 bolt with lockers and beadlocked 40" Bias Super Swamper IROK rubber. Being spun by a 400HP EFI 383ci Chevy through a turbo 350 and Atlas 4 speed. Even with a 10:1 crawl range, and all the torque multiplication that implies, I never broke the differential gears. Plenty of other parts, but not the ring & pinion. But I'm going to text one of my kids. I've posted his credentials elsewhere, but the short version is an engineering PhD and a job crashing and/or blowing up trains and finding ways to make them safer. Currently working on the Hyperloop project. I'll ask him for a definitive answer and post it when he replies. [/QUOTE]
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Jeep Wrangler JK
JK Build Threads & Member's Rides
JK high school build
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