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12 Bolt Aluminum Cover - Added strength or no?

359 Views 7 Replies 7 Participants Last post by  joe_padavano
Hey guys. This is for all you Chevy truck 12 bolt experts out there. Do you believe that a cover such as this adds any real overall strength to a 12 bolt? From the vendor:

Rim Automotive wheel system Bicycle part Silver Watch

"Made from 356-T6 cast aluminum, these girdles incorporate a reinforced crossbar. The crossbar houses the load bolts that apply pressure to the bearing caps. This feature, along with the thick casting, prevents bearing cap deflection under severe loads. Which in turn greatly reduces or eliminates (in most cases) bearing cap fatigue and failure. "



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· Old(s) Fart
6,243 Posts
The whole point of these girdle style covers is that you adjust the two preload bolts to minimize deflection in the bearing caps holding the carrier in place. The problem with this design is that aluminum only has about 1/3 the stiffness of the iron center section, so unless you crank on the bolts a lot, the aluminum cover deflects under load. It's not the best design, but it probably provides SOME additional support to the caps. The real problem is that people confuse "strength" with "stiffness".
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