I just got my Rock yesterday!!! They due make a high speed worm gear kit for this truck.
Also I have been look here
http://www.rccrawler.com/
Alot of good Rock Force Builds here
http://www.rccrawler.com/forum/forumdisplay.php?f=155
Maxamps Lipo's
FLM Savage 5s 5000
Mamba Monster V2
Feigao XL 10
E-Revo 4s 8000Novak HV 6.5
E-Maxx 4s 6000Novak HV 6.5
Speed-T 3s 5000
For Bashers, By Bashers -
http://www.BigSquidRC.com