Both Nick Caro and myslef have posted on how to set and install diffs in the FS, do a search in this section for "diff" with either RogerM or njc11 as the poster and they should come up ... search for posts not threads though.
If not post back and we'll try to answer for you here (or more likely find the original posts as they are both quite long).
Generally the Kyosho diffs are awesome, I rarley feel the need to rebuild mine as they stay so smooth and hold their setting very well.
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