Make sure you get the pattern and backlash perfect, not just good enough. It's not a job you'll want to do again later having to replace more broken/worn parts. Especially bearings and gears, because then you'll need shims for sure. Also be sure to check your pattern and backlash every 90 degrees. This is to make sure it's consistent and there's no debris between the carrier and the ring gear, or that the gear isn't warped.
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