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The rear wheel bearings are pressed in on the E46. Your going to need a few tools like a slide hammer to remove the hub, a bearing seperator to get the inner race off of the hub, and a bearing press to press the new bearing in.
An air hammer will make it a whole lot easier to remove the rear axle as well. They usually get seized in there and hitting it with a punch like in the instructions below just wont work.
Here is a link to the replace the rear wheel bearing in the E46 3 series.
Let me know if you need anymore help.
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