1. Yes. Input bearing off the stock 5 speed transfer case from the turbo will swap with whatever input you put on it.
2. 6307 input roller bearing. It is on our website. And the countershaft roller bearing 63/32. That is also on our website.
3. Nachi/koyo bearings are superior and are very good quality and straight from japan.
Hope this all helps. Thank you!
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