If you don't have the shocks already, a .6 shock is basically a 3-1/2" shock. We have the 3-1/2" Traxxas aluminum big bore shocks back in stock if interested.
http://www.crawfordperformanceengineering.com/product_info.php?products_id=56
http://www.crawfordperformanceengineering.com/product_info.php?products_id=56