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Rear Differential Fill Level Question

754 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.
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