My '97 has an open 4.10 gear and in the right condition the rear end will slide out, but conveniently it's a mile long (that wheelbase is kinda out there, I like the wheelbase of a 4 door explorer better... even after 50k miles and 3 years I still park dumb with the '97 but the '00 Explorer parks perfect...) so "most" of the time it's easy to recover

, way better than the square wheelbase of the old Geo Tracker I had, that thing would go backward if you weren't careful sometimes...
Like everyone says, I don't think the trac lock is a night and day thing, it helps a little but there's only so much those tiny diameter clutches can do. I'm a firm believer in driving on the edge of conditions though, I know where the line is and try to stay on the right side of it and am getting better about recovering if I cross the line, me and the '90 Ranger have been through a lot, I push it pretty hard at times but I know it pretty good, I'm pretty sure it looks kinda funny when I'm doing some things with no sway bars at all... might drive it to work a day next week just for giggles...
Here's the spider gears that were in my '00 Explorer 8.8 when I got it, it lost rear drive... the clutches had NO friction material left, this is what happens with an extremely neglected stock limited slip ford axle...