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Message: [QUOTE="Dave_Nevada, post: 1501214, member: 29749"] Hi Byron, If it's all the time it sounds like you may have some slop in your bearing preload. Another cause can be a ****ty pilot bearing. If that pilot bearing is the needle bearing roller style, my money is on that. I have tossed the needle bearing roller style in my 7.3 with an old skool bronze Oilite bearing in mine. That bearing is used with a 68 302 Mustang with a toploader, and a few other Ford vehicles. Dorman 690-039 [url]https://www.dormanproducts.com/p-24562-690-039.aspx[/url] it works perfectly and I have had no issues with it. Others on here have done the same. DO NOT USE iron sintered types, they will grind your input shaft to crap. Use only Oilite types. if you're running a 6.0, you will have to have one machined, but it's worth it. The input shaft on a 6.0 is 1", hence the requirement to have a bearing machined. Keep in mind the slop tolerance for your input shaft isn't much. If you have a sloppy input shaft pilot bearing (or one that has run out of lube), that can cause whining throughout all gears and it destroys your input shaft. Other than that, I'd have to tear it down to look at the gear races to see what is exactly wrong. Heat plays a huge factor with these ZF6's, so change your lube regularly. Heavy load towing is hard on the lube. [/QUOTE]

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