emaxx spur gear - smaller=less torque?

[maximum]

Hello,
Towerhobbies - the wal-mart of rc stuff!! Although I got an incredible deal off ebay for the proline kit which included the powerstroke shocks, front and back cvd's, and titanium rods for $100. I also bought from tower center cvd's, front and center integy skid plates and motor heat sinks off ebay. I am keeping the stock motor set up and will have 1 set of 6 cell packs and 1 set of 7 cell. I don't think I should break anything in the diffs or tranny if I'm somewhat carefull!!! we'll see.