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Game changer Wheres the photo shoot???
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<blockquote data-quote="TBItoy" data-source="post: 259247" data-attributes="member: 1384"><p>The problem with a 14 bolt front is the high hypoid ratio (just like a Ford 9") (Pinion is farther from center of ring gear)</p><p></p><p>IMO the pinion snout bearing is more for extra support when when running on the coast side (reverse in rear, or forward with a front axle). Because when in reverse, (or forward if the axle is in the front) the ring gear is trying to <strong>pull </strong> the pinion into the case.</p><p></p><p>Pinion deflection is NOT as big of a problem as people talk about, especially when running gears in the correct direction.</p><p></p><p>Carrier bearing/Ring gear deflection IS a problem, and that is why a load bolt makes the gear sets last much longer.</p><p></p><p></p><p>The common assumption is that the weak point of a Dana 60 (& 70) gearset is the 29 spline pinion shaft. That was the reason for the 14 bolt front, the massive pinion shaft & a ring gear big enough to take the abuse running on the coast side.</p><p></p><p></p><p>IMO from an engineering stand point, the HP Dana 70 gears with 35 spline pinoin from Currie are MILES ahead of a 14 bolt front. BUT... Just the gearset is $500 <a href="http://www.currieenterprises.com/cestore/Products4x4.aspx?id=3851&p=499.9500" target="_blank">http://www.currieenterprises.com/cestore/Products4x4.aspx?id=3851&p=499.9500</a></p><p></p><p>And then you gotta get a JANA76 kit, or find a factory HP70 (rare), or buy a Currie RockJock 70 center section... Which is big money when you can pick up a 4.56 geared 14bolt with a Detroit (CUCV rear) for ~$300-500.</p><p></p><p></p><p>The sheer size of a Dana 80 puts it into another catagory all together. The Dana 80 has a relatively low hypoid ratio (pinion is more centered) so in the front, it's not trying to pull the pinion into the housing as bad, plus the sheer diameter or the ring gear takes a TON of abuse off of the pinion (simple leverage). The reason a Dana 80 has a massive pinion shaft is to handle the large input torque they were designed for (Cummins duallys, motorhomes, etc)</p><p></p><p>(not sure what diff this diagram is of, but it shows hypoid gears. More centered pinion=lower hypoid ratio, lower or higher pinion= higer hypoid ratio)</p><p><img src="http://valuablemechanisms.files.wordpress.com/2010/05/hypoid-gear.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="TBItoy, post: 259247, member: 1384"] The problem with a 14 bolt front is the high hypoid ratio (just like a Ford 9") (Pinion is farther from center of ring gear) IMO the pinion snout bearing is more for extra support when when running on the coast side (reverse in rear, or forward with a front axle). Because when in reverse, (or forward if the axle is in the front) the ring gear is trying to [b]pull [/b] the pinion into the case. Pinion deflection is NOT as big of a problem as people talk about, especially when running gears in the correct direction. Carrier bearing/Ring gear deflection IS a problem, and that is why a load bolt makes the gear sets last much longer. The common assumption is that the weak point of a Dana 60 (& 70) gearset is the 29 spline pinion shaft. That was the reason for the 14 bolt front, the massive pinion shaft & a ring gear big enough to take the abuse running on the coast side. IMO from an engineering stand point, the HP Dana 70 gears with 35 spline pinoin from Currie are MILES ahead of a 14 bolt front. BUT... Just the gearset is $500 [url=http://www.currieenterprises.com/cestore/Products4x4.aspx?id=3851&p=499.9500]http://www.currieenterprises.com/cestore/Products4x4.aspx?id=3851&p=499.9500[/url] And then you gotta get a JANA76 kit, or find a factory HP70 (rare), or buy a Currie RockJock 70 center section... Which is big money when you can pick up a 4.56 geared 14bolt with a Detroit (CUCV rear) for ~$300-500. The sheer size of a Dana 80 puts it into another catagory all together. The Dana 80 has a relatively low hypoid ratio (pinion is more centered) so in the front, it's not trying to pull the pinion into the housing as bad, plus the sheer diameter or the ring gear takes a TON of abuse off of the pinion (simple leverage). The reason a Dana 80 has a massive pinion shaft is to handle the large input torque they were designed for (Cummins duallys, motorhomes, etc) (not sure what diff this diagram is of, but it shows hypoid gears. More centered pinion=lower hypoid ratio, lower or higher pinion= higer hypoid ratio) [IMG]http://valuablemechanisms.files.wordpress.com/2010/05/hypoid-gear.jpg[/IMG] [/QUOTE]
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