so if Ford thought it was such a good axle, why was the 9" only put in half ton trucks and not the 3/4 and 1 tons? Oh yeah because they had a stronger Dana 60 and 70's to put in. The 9 needs a back brace because most are only .125 wall stamped steel banjo assemblies and not 3/8" thick cast steel center sections...holding those 1/2" wall tubes together....
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so if Ford thought it was such a good axle, why was the 9" only put in half ton trucks and not the 3/4 and 1 tons? Oh yeah because they had a stronger Dana 60 and 70's to put in. The 9 needs a back brace because most are only .125 wall stamped steel banjo assemblies and not 3/8" thick cast steel center sections...holding those 1/2" wall tubes together.... 
