You can drift a FWD car, people who say otherwise are lying.... The majority of rally cars are FWD.... Here is how you would do it on gravel (or pavement, but you would need alot more momentum)Accelerate into a corner
turn sharp, and quickly in the opposite direction of the apex....
and quickly turn back towards the center/inside of the corner, you have no effectively transfered momentum, and a ton of weight to the front outside wheel, digging it into the surface, and creating a pivot point....
to properly execute the drift/slide whatever, as soon as you feel the rear end slightly unweight, and the front outside tire start to push, begin modulating the brake with your left foot, and the gas with your right... You will probably need to initiate slide with sharp application of the brake, and quick application of the throttle at the moment of tire bite...
This technique is called the Scandanavian Slide, of Finnish Flick... It is very sucessfull, and works great. You will see almost all rally drivers implement it in someway (except those pesky active diff equipped WRC cars)
You can slide or, drift, perfectly around many a corner with this technique.