I agree with the answers here.
1: Strength(3 pinion support bearings)
2: Ease of gear changes.(Can be done in 1/2hr) with the right tools.
3: No need for C-clip eliminators.(axles don't fly out)
4: The 8" was the same design but brings the weight down, also not as strong.
Dana 44(I think is the #), I have heard this is even stronger than a 9".
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82 Mercury Capri 302.
Comp. Cams
Tremec 3550
3.73's
12.8@106 N/A
Kevin's Capri