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Rear Differential Fill Level Question

757 Views 15 Replies 8 Participants Last post by  canyon56
Any tricks and tips for not overfilling my 2003 Sierra 1500 Z71 rear differential fluid. The factory recommendation is to fill 5/8" to 1 5/8" below the fill hole when the oil is cold. Thanks for sharing your wisdom.
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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.
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.
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