Duster rear end compatibility

YY1 said

My Duster exhibited no ill handling tendencies whatsoever.

It was frequently driven in a spirited manner and even drag raced.

The extra track width in the rear actually improved handling a bit.

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Did you use a 71-74 B-body rearend?? That's what the OP is asking about. Everything else is irrelevant to the OP. This thread was done by the second post. A 71-74 B-body rearend cannot be used in a 70 Duster without modification.