simple ,,,, as you rebuild your motor amps will go up as well witch it means higher RPMS and lower torque unless you are tuning your motors with a dyno, there for you need to adjust your gearing based on rollout ((tire sizes)), dont pay to much mind to final ratio due that sometimes it wont help you.
SERPENT S811 AND S811T, FUTABA 4PKS , viper rc solutions
OS SPEED WORLDS EDITION 21 , OS 2060 PIPE
BYRON %30 FUEL , PROTEK 2300 LIPO RX PACK
SAVOX SERVOS 1268MG HV , 1267MG HV