actually, having a third member doesn't have anything to do with the axle popping out if you snap it. that's the difference between semi-floating and full-floating. in a semi floating axle, the axle supports the weight and load of the truck. in a full floater, there's a hub and inner/outer bearings(like a front axle on a toyota, or any other solid axle truck). the axle shaft just takes the force of the engine, and the load is supported by bearings. if you break a full floater, the wheel stays attached since there's a hub, semi floaters will spit the shaft and tire
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