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With the drums removed, the axles simply slide out. In order to use the GM rotors, you'll have to turn the stock axle flanges down to 5 7/8-inch o.d. Standard factory-type axles are easily machined on a lathe, but if you're using aftermarket axles, be sure to consult the manufacturer to see if they have heat-treated flanges before attempting to machine them. If they are heat-treated, now's the time to ask the manufacturer for a recommendation.