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2013-14 Shelby GT500
8.8 gear noise question/theory
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<blockquote data-quote="Husky44" data-source="post: 13981034" data-attributes="member: 142759"><p>My guy didn't check preload before disassembly, but his diagnosis on tearing down my first swap (done by a friend with a couple of decades experience doing drivelines for a living), as well as this install, both cases were that the pinion had "walked", which I understood to mean that the washer had crushed farther, allowing the pinion depth to change. If we tear down again, I'll have him check preload before teardown, to see how much it's changed since he did the install.</p><p></p><p>On the first install of my 3.73s, my buddy set backlash to the tight end of the tolerance (which he thought was still too loose!). In both cases, backlash was wayyyy loose on teardown (don't remember numbers, but out of tolerance on the loose side). </p><p></p><p>I stated in another thread, but I've read on multiple offroad forums where guys setting up 8.8s got the pinion depth, with the proper preload set, then measured the crush washer, and replaced it with a solid washer/sleeve machined to the same depth, basically preventing further crush (which appears to be a problem). </p><p></p><p>I'm not a professional mechanic, or automotive engineer, but all of my professional training tells me that when you have the same defect, on an install by two different qualified people, particularly on equipment that is essentially 25 years old (basic 8.8 rear end setup), with the only significant change being a design change of one component (pinion bearing), directly related to the failed component, then the problem likely lies with the changed component. </p><p></p><p>At this point, my next step is dynamat. I'm going to try to muffle the noise coming through the floor, and see if I can live with it. If it gets worse again, I'm debating whether to just swap the whole assembly to the Ford Racing 3.73 setup, which I believe (but will verify) has the smaller pinion bearing of old. </p><p></p><p>Does anyone know if the Boss 302s had the larger pinion bearing? Are they having problems with gear noise?</p></blockquote><p></p>
[QUOTE="Husky44, post: 13981034, member: 142759"] My guy didn't check preload before disassembly, but his diagnosis on tearing down my first swap (done by a friend with a couple of decades experience doing drivelines for a living), as well as this install, both cases were that the pinion had "walked", which I understood to mean that the washer had crushed farther, allowing the pinion depth to change. If we tear down again, I'll have him check preload before teardown, to see how much it's changed since he did the install. On the first install of my 3.73s, my buddy set backlash to the tight end of the tolerance (which he thought was still too loose!). In both cases, backlash was wayyyy loose on teardown (don't remember numbers, but out of tolerance on the loose side). I stated in another thread, but I've read on multiple offroad forums where guys setting up 8.8s got the pinion depth, with the proper preload set, then measured the crush washer, and replaced it with a solid washer/sleeve machined to the same depth, basically preventing further crush (which appears to be a problem). I'm not a professional mechanic, or automotive engineer, but all of my professional training tells me that when you have the same defect, on an install by two different qualified people, particularly on equipment that is essentially 25 years old (basic 8.8 rear end setup), with the only significant change being a design change of one component (pinion bearing), directly related to the failed component, then the problem likely lies with the changed component. At this point, my next step is dynamat. I'm going to try to muffle the noise coming through the floor, and see if I can live with it. If it gets worse again, I'm debating whether to just swap the whole assembly to the Ford Racing 3.73 setup, which I believe (but will verify) has the smaller pinion bearing of old. Does anyone know if the Boss 302s had the larger pinion bearing? Are they having problems with gear noise? [/QUOTE]
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2013-14 Shelby GT500
8.8 gear noise question/theory
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