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I'm having trouble identifying the drain plugs on 5.3L. One page of the shop manual shows them near the front and the next page shows them near the rear. There are two rather large plugs near the rear - if these are the one's, would anyone know the size of allen wrench to use? It looks very...

The owners manual of my 2WD 03 Yukon has checking the axle fluid every 7500 miles. (Axle fluid and rotate tires every 7.5K mi, air and fuel filter every 30K). Checking axle fluid seems a bit silly and unnecessary but usually the maintenance schedules have a reason for listing such things...