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Difference in differentials.

THEFERMANATOR

FRANKENBURBAN
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The 3500 is a 10.5" 14 bolt full floater, 3500hd is a true dana 80, and the 4500 in a GM is a medium duty truck using a good sized spicer rear diff. GM hasn't built a 4500 like Ford did that was based on a pickup for a long time now.
 
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