So are the diff gears you have HPI87193?

I never noticed before, but I'm pretty sure they are the same as the HotBodies hardened steel internals. Would make sense since they both fit the Vorza cup, and HotBodies and HPI are more or less the same company.

Good to know, as I bet the HPI gears are more readily available since almost every LHS keeps Savage stuff in stock.

Yes; 87193. As for the Hardbodies, others have noted that they are slightly thicker gears than the stock Savage Flux ones.

http://www3.towerhobbies.com/cgi-bin...1&I=LXJLH6&P=K