Even with stock parts, the way that it is assembled and small changes make a huge difference. Guys like John Sheperd have spent years and years playing around shimming, clearences, making small changes to parts, etc and have learned how to make a tranny last longer and shift better. Anybody can take apart and put back together a tranny, but to actually know what works and what doesn't takes some trial and error on actual high HP cars. There are some parts that can be swapped from one model year to another like the double syncro shit and EVO shift forks and getting rid of the terribly weak 3-4 gear in the 94+ trannies.
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