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I put the shim under the cup in the housing because we have the tool to remove it and because so many carriers are marginal re fit of bearing in the first place. I have found that we having more carriers with spun or close to spun bearings so do not want to be pulling the tapered bearing on and off any more then necessary. While there are maybe a lot of carriers out there, does not mean that they are usable. If the spider gear wear area is bad or the bearing just drops on they are toast. Sometimes they can be saved, but not all the time.