Gear ratios for new motors
 

I'd like to change the motor for my Wild char G( The Raise Tiger) and currently have a 3.0 Tomy motor available and was wondering if it would also be better to change gear ratios as well..
I'm a total noob at this so any help would be appreciated.

you can't change the gear ratio on a wild char-g, you can however change the motors they have, just simply remove and replace.