Everyone says put the new tires on the rear... And I understand the argument but I disagree with it, personally I would always put new tires on the front (if Im only buying two, which I don't think I have done that since I was pinching pennies in college).
Let me preface this by saying that I am comfortable with this because I have been extensively and professionally trained in vehicle control and recovery (a need to know when handling someone else's 200k track car). If you are thinking about putting two tires on your teenagers FZJ-80 (or any vehicle for that matter) I would strongly suggest you do all four. To handle more traction in the front than rear takes a patient and knowledgeable driver.
Now let me explain further, I get why they say to put new tires on the rear because for the average joe or jane oversteer can be a scary thing and if the driver is unfamiliar with the situation usually results in driver lock up. Uncorrected - or overcorrected - oversteer can turn into pretty bad wrecks. So new on the rear makes sense for most drivers.
But before I get flamed let me tell you why I prefer new tires on the front. If my vehicle knocks sideways I want to have the best bite possible at the front end so that I can counter the slide. In the event you lose traction at the rear having 8/32nd more tread wouldn't have done much more for you anyway, something else is wrong (overdriving conditions is a typical cause).
Furthermore most of your braking happens at the front tires and understeer is just as dangerous as oversteer. So if you cant stop because you are sliding around on the front you will rear end someone. Or think about making a corner on a undivided highway, hitting a patch of slush and understeering into head on traffic, not a good scenario to be in.
IMO by putting new tires on the rear and not the front you open yourself up for many more dangerous situations that happen more frequently while maybe lessening your chance of an oversteer condition that shouldn't happen if you aren't overdriving the conditions anyway.