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im guessing you are reffering to a fully complete 8-3/4 rearend,if so,and i'm guessing here,but i will say somewhere between 200-300 pounds complete
My street Cuda small block w/auto was 1625 rear, 1835 front w/o driver...8 3/4 rears can take alot of abuse, unless your making 500hp with a big tire..
Street ? Strip ? Pro-Mod cruiser? H.P. ? Tire size? Auto? Stick? etc.-etc.All depends on what your going to do..