And... I almost forgot. The most important part of any of this:
Diff shims.
http://www.ebay.com/itm/Kyosho-Infer...oAAOSwMHdXQ36J
Pinion shims:
http://www.ebay.com/itm/Kyosho-96644...MAAOSwaB5XmhJd
I am currently running the Kyosho diffs in Unlimited Engineering Ultralite cases, so I can't speak for their proper shimming to fit in the Fastlane cases.