Keep it to the front. If you break a front u joint, the shaft is still bolted to the pinion...there is no way to stop the pinion from spinning. Plus the flying front end is to close to me for comfort. If you break a rear joint, your first reaction will be to put it in neutral, or push in the clutch. Therefore removing the force that is spinning it. Also, the transmission has a slip joint, so the broken shaft will more than likely slip out.
Just my .02,
Joe
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