Auburn Gear Differential in '72 8 1/4 Housing?

JR_Charger

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I see that Auburn Gear makes two differentials for the 8 1/4 - the 27 spline AG 546072 for 68-96 and the 29 spline AG 546074 for 97-present. I'm planning to have custom 29 spline axles cut, so is there any other reason why the 546074 wouldn't work in the 72 housing?

I also found this - "IMPORTANT: Chrysler 8-1/4” applications require modification to the axle housing as shown to provide clearance for the differential case. Clean housing after grinding." - from here - auburngeardiffs.com/product/546074/

But the site doesn't actually show what needs to be done, so I have no idea what they're talking about.
 
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