Duster rear end compatibility

YY1 said

The OP asked about "without any modifications".

I told him I have personally installed a 65-67 B body 8 3/4 in a Duster without any modifications to the axle.

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Did you miss the part about the 73 Charger rearend he was specifically asking about? Your experience with a 65-67 b-body rearend is irrelevent to that question.