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Tech & Fab
Front drive shaft carrier bearing
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<blockquote data-quote="patooyee" data-source="post: 345741" data-attributes="member: 483"><p>Even with a solid-mounted drive train, things move a little. That means the distance from t-case yoke to carrier bearing changes just a hair. (It will change more with rubber or poly mounted drive train.) Without slip in that intermediate drive shaft the length changes are forced into either the bearing or the bearing housing.</p><p></p><p>My theory on the big seller HAD SS housing bearing being so popular is that some don't understand this length change and they eventually crack or shatter a cast housing. They figure, "Oh this **** was weak!" Then they buy the SS version because Jesse says it is strong. Lo and behold, they stop breaking housings because now it is SS! But then the bearing doesn't last as long. Or then they crack trans tail housings. Or whatever the next weak link is. Some never have an issue at all because the life span of a buggy is nothing compared to the designed life span that the bearings are intended. They might last 5 years in a buggy whereas they might be designed to last 30 years in an OEM vehicle. But everyone builds a new buggy every 3 months these days so who would know that the bearing wasn't going to last?</p><p></p><p>Most OEM 2-piece shafts use a rubber encapsulated bearing, even in applications as large as over the road tractors. (Does anyone think we are applying more torque than a 1500 ft/lb diesel hauling 200,000 lbs or cargo out of a stop light?) The beauty of those is that the rubber flexes to accommodate this length change. I think a lot of people see the rubber bearings with sheet metal brackets and say, "Oh, that's a good idea, but I'm going to make mine even more bad-ass by getting one of these here cast or SS bearings with no play in them." They don't stop to think why the play was there to begin with.</p><p></p><p>There's nothing wrong with the cast or SS bearings, but they change the design of the system that people think they are copying. People see that OEM doesn't have a slip and don't figure they need one but they do if they don't use a rubber bearing like the OEM did.</p></blockquote><p></p>
[QUOTE="patooyee, post: 345741, member: 483"] Even with a solid-mounted drive train, things move a little. That means the distance from t-case yoke to carrier bearing changes just a hair. (It will change more with rubber or poly mounted drive train.) Without slip in that intermediate drive shaft the length changes are forced into either the bearing or the bearing housing. My theory on the big seller HAD SS housing bearing being so popular is that some don't understand this length change and they eventually crack or shatter a cast housing. They figure, "Oh this **** was weak!" Then they buy the SS version because Jesse says it is strong. Lo and behold, they stop breaking housings because now it is SS! But then the bearing doesn't last as long. Or then they crack trans tail housings. Or whatever the next weak link is. Some never have an issue at all because the life span of a buggy is nothing compared to the designed life span that the bearings are intended. They might last 5 years in a buggy whereas they might be designed to last 30 years in an OEM vehicle. But everyone builds a new buggy every 3 months these days so who would know that the bearing wasn't going to last? Most OEM 2-piece shafts use a rubber encapsulated bearing, even in applications as large as over the road tractors. (Does anyone think we are applying more torque than a 1500 ft/lb diesel hauling 200,000 lbs or cargo out of a stop light?) The beauty of those is that the rubber flexes to accommodate this length change. I think a lot of people see the rubber bearings with sheet metal brackets and say, "Oh, that's a good idea, but I'm going to make mine even more bad-ass by getting one of these here cast or SS bearings with no play in them." They don't stop to think why the play was there to begin with. There's nothing wrong with the cast or SS bearings, but they change the design of the system that people think they are copying. People see that OEM doesn't have a slip and don't figure they need one but they do if they don't use a rubber bearing like the OEM did. [/QUOTE]
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