In some conditions, mostly high traction a front locker makes steering very difficult, not good for the road in a full time four wheel drive. A rear locker is much more effective, I would start there, then decide if you need more.
How much time do you have on the trail? There are two arguments on lockers for newbies. The first one is that they increase traction allowing safer wheeling. The second is that lockers allow you to get deeper in trouble before evaluating the situation.
The second one is my favorite, with a locked truck in some circumstances you can drive the truck up steep enough to roll it onto it's roof without loosing traction. In an unlocked truck most of the time you will loose traction, forcing you to evaluate your situation and take a better line. A locked 80 is sometimes referred to as point and shoot wheeling, meaning that the line you drive over an obstacle is less important, steer over it, if you lose traction hit the magic switch. With an unlocked truck the line you drive is much more important, you have to keep three wheels on the ground to have traction. Seeing the line to drive on the trail and ether getting in and out or working with a spotter to follow it, is a key skill to learn and an unlocked truck forces you to learn it.
My recommendation is to put a lift on then get some tires, now or when yours are junk and wheel it. Getting seat time on the trial is the best teacher. The best runs for learning are runs to play areas where there are lots of obstacles close together and go with more experienced wheelers, watch, listen, ask lots of questions and learn from them. Maybe we should plan a skills development type club run?
An unlocked 80 is a very capable wheeler, you will be shocked at where an experienced driver can take one! Get to know your truck, it's capabilities and what you want from it, then do the big mods!
