Yup, owner of a 86 sr5 turbo pickup here...
I've messed around with my truck a little, but it really doesn't like to kick the rear end out. I'm playing with the idea of lowering it a little, installing a rear sway bar and installing some adjustable shocks, a lsd and taking it to DDay2... The tight course wouldn't be the greatest for my 'has every option ever offered' (read - heavy, even has a power antenna!) extended cab pickup, but tempting as I don't think I'll have my new corolla ready....
Sure it doesn't take much to break the (one) tire loose but with no weight in the back and no lsd the rears are sort of just along for the ride and stay behind the front wheels... I have a feeling my weight ratio is like 70-30 or even worse! If I play around with It I'm sure I can get some decient drifts in it though...
-Jeff