There are two levels of RC Drifting,
Standard 4WD TC with drift tires is known as "50/50" now days
Overdrive the rear is known as "CS" aka "Counter Steer"
50/50 systems are same front and rear FDR thus front spins the same as the rear, These you turn in then wheels square up and you slide around the corner looking like your on ice with a 4WD power slide, not very realistic, there is some counter steer with these setups but its only between corners or switch backs.
Counter Steer systems are allot more difficult to get setup correctly... Since you over drive the rear you have to hold the front wheels at locked or counter angles to get the car to go where you want , this is the most realistic form of RC drifting and once you run a CS car you wont go back to a 50/50 setup its just not as fun.
Some guys run a oneway in a CS car but i find CS setups with a oneway are unpredictable and to drift quickly with a CS you need to have brakes to help initiate high speed switch backs, braking with a oneway doesnt happen you'll just spin out, and the front wheels free roll and make cornering off power unpredictable.
check some drift sites for more info, http://csjunkies.com/
is where alot of the info can be found. there are kits out there for cars but some mods are required and some car just wont be able to CS convert them, I spent a pile of money researching and buying parts trying to make it happen as CS was early days when I converted my car, I believe my Hotbodies TCD was one of the first to be converted outside japan, and i documented it well on driftercentral website.
My setup can be found on CS junkies http://csjunkies.com/viewtopic.php?f=34&t=628