You can buy the pn bearing set, or bearings from companies like boca bearings. As for the ball diff it really is not a lot of maintenance unless you are racing competitively and even then I only rebuild it once a month. Ball diffs make adjustments easier and more precise . If you want to stick with a gear diff pn and atomic make aftermarket versions that are better and more adjustable than the stock unit. But IMO there is a reason 1/12 pan cars still use ball diffs.
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