How can you tell what rear end you have ??

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ILLDuster74

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I have a 74 Duster with 30,000 miles on it. Its basically a survivor but needs a lil TLC. It has not been molested but does anyone know the codes that can tell what rear end is in it? is it the 7.5 or the 8 1/4?
It does have 10 bolts in the diff housing.
Its a 318 2b with an automatic (904)?

Thanks
 
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