i know a g3r could handle a 6s setup! i had a g2r running a lehner 1950/8 on 6s with stock diffs! only problems i ever had were snapping the roll pin on the input shaft(easily fixed with allen key) and a stock bearing blowing out in the rear diff. the truck would hit 50mph consistantly with moderate gearing! i would recommend this setup to anyone.
I've still got that FLM maxx roller chassis NL12..... if you are interested?
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens