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Why is it such an issue whether the bearings are already in the shells or not? They're not THAT difficult to install...
Shimming them, however, requires extreme precision. Shimming of bearings has to be very accurate compared to bushings. It's easy to get fooled on how well they're shimmed because the bearings rotate on their own.
Failure to shim bearings properly can cause them to explode... which would destroy everything else in your gearbox. :P
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