as said, the smaller gear will remove with persuasion. after that there is a small pin. remove this and then the outdrive will pull out of the spur without issue. be carefull to remove all the orings, shims etc and put them back in the same order (sorry to teach to suck eggs) or you will have leakage from the diff when you rebuild it
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Nathan Ralls HPI, Custom Blitz, www.piraterc.com mr-o foams
woop woop racing officialy keeping team toe out inline 
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