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Even with all of their aftermarket support, they still have a smaller pinion than a Dana 44, that is why I would upgrade to a 70, cheap, lots of choices and easy to build. All of the big truck manufacturers used them, AMC, IHC, Ford, Chevy, GMC, Dodge, etc. Could not have been that bad for all of them to use them in their heavy duty applications.
Some info comparing a truck 70 vs 60
http://www.billavista.com/tech/Articles/Dana_70_Rear_Axle/index.html

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Yeah they work great in trucks.. my truck has one
but they arent for race cars or street rods... HEAVY
and have 3/8" thick tubes at OVER 3.5"

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My B-body width 70 housing weighed 68#, 3# over a comparable 60..but I am from the "go big or go home" mentality, that is why I have one behind my 572 hemi...Tim

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Then you have to have the HD 60 housing to be within
3#... the HD has the big thick heavy tubes

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I think they were 1/2" wall tubes, almost indestructible...Must have been an HD...tim