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Like all ARB diffs, a hole needs to be drilled in the housing for an air fitting to be installed. Remove the carrier bearing bolts, caps, and adjusters, then remove the stock carrier. If you're changing ratios, remove the driveshaft and pinion yoke, then drive the pinion out, followed by the pinion races. Finally, drill and tap the air hole with a 1/4-inch NPT tap in the correct location, then clean the housing up within an inch of its life.