Rear Differential Fill Level Question

Azcheby said:

I'm curious why GM recommends this. Every truck I've owned called for fill till it runs out the hole. That goes for T cases, diffs ect. 1 5/8 below the fill hole would seemingly starve the wheel bearings.

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Yeah, this ^^^^^^^^^^^^ a million times. I used to be in the trade, and I've filled THOUSANDS of diffs and trans (standard) using this method. Never, ever had one problem. And his point about the axle bearings is very relevant, those babies need to get some lube.