http://www.hotfords.com/svt/lightning/spec's.htm

Your lightning has a 57%/43% weight distrubution, (ideal is 50/50), and you weigh some 4,670 lbs (over double what my ae86 weighs) and have a fairly imprecise leaf sprung rear end. But the good news is you have some 380 hp!

I think anything rwd is driftable. Sure some things are easier to drift, but I've heard it said drifting is 90% driver and 10% car. So the real question is if YOU can drift, not your truck. Get some cheap rear wheels/tires and try it!

-Jeff