Just for reference
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D44, D60 and Rockwell
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Rockwell next to D60
I can't find a side by side shot of the D60 ring gear and the bull gear of the rockwell, but it's pretty much twice as big.
Around here a pair of rockwells, non-steer rear are going for about $1500 in good usable shape. A ford 60 KP axle and a sterling or 14 bolt will run you about $800-$1000 right now in good usable condition. spand another $1500 for shafts, $700 for knuckles, $1000-$3000 for carrier/locker and gears. rockwell simply make sense. plus since the pinon on teh top loader sits so high, you driveshaft angles are not all that bad.