hey fred
i have the 18ss kit.
the only things i upgraded are
air filter
billet alum front c hubs
hitec 645 steering servo.
hitec 625 t & b servo
street tires and wheels.
roto start back plate.
i was going to try and find the 2 speed trans but my LHS talked me out of it.
i`m glad he did. the truck is fast enought for me with the one speed.
thats it. i like this truck better than my savage.