8 3/4 rear end.

33IMP said

The chart i believe (a stickie in the drivetrain forum here) says the 62/63 b-body 8 3/4 is almost 1 1/2 wider than an A-body 8 3/4, and almost two inches wider than an a-body 7 1/4. (Drum face to drum face). And of course the spring pads are in a different location.

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I put a Road Runner 8 3/4 rear end in my Dad's 62 Dodge. Bolted right in.

BTW, in 62, Polara and Dart used the same body and 116 inch wheelbase chassis, as did the 62 Belvedere and Fury. They are all basically B bodies (although the rear springs are interchangeable with A bodies).

A 62 Dodge rear axle will not readily fit a 65 Valiant.