I run on a medium to high bite clay track as well. As for traction I would get:

1- fast laps clutch basket
http://www.fastlapproducts.net/Products.html
2- rcshox garo disc set
http://www.rcshox.com/associated-dual-garodisc-sc1044/
3- exotek front locker
http://www.exotekracing.com/sc10-4x4...-front-clutch/
4- track star shock o-rings and shock snot.
http://www.trackstarrc.com/trackstar...mart&Itemid=64
http://www.trackstarrc.com/trackstar...mart&Itemid=64

As for steering:

1- M2C rear toe block
http://www.amainhobbies.com/product_...e-Block-System
2- Factory team Ackerman bar
http://www.amainhobbies.com/advanced...1181&x=10&y=10
3- exotek or hot racing rear hubs
http://www.exotekracing.com/sc10-4x4-rear-hub-set/
http://www.hot-racing.com/index.cgi?...SCF22G01;c=617
If you are looking for a more stable, better planted and better handling truck, I would run:

1- Exotek chassis
http://www.exotekracing.com/sc10-4x4-lcg-alloy-chassis/
With the saddle pack mount:
http://www.exotekracing.com/sc10-4x4...or-exotek-lcg/

There are a few other mods I personally run but some here would contest their performance benefits, although I feel they do through personal experience.