The Sundered Skies Deluxe Conversion (a free download) says so:
We absolutely agree with the removal of the Guts skill—in fact, we have played without it in our Sundered Skies games for some time now. Player Characters should be re-tooled, reassigning the skill points and level up advancements which were applied to the Guts skill. Any modifiers applied to the Guts skill are now applied to the Spirit roll instead.
The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.