Not sure why not. What it "locks" is the gear part -- it re-integrates the differential, if you will. The linkage part outboard of that isn't involved, right?
Anyway, I would expect steering to be weird and tire carnage to be awful if you left it locked up in normal driving. Thus front lockers are almost always the selectable type.
They are installed by yer more extreme off-roaders, especially those who go in for steep and rocky terrain where you really, really don't want to either lose the only bit of traction you've got or suddenly dump a whole lot of power into a big tire and wheel spinning free in the air.
Rear lockers of various sorts are a bit more common. Chevy Avalanche and Toyota PreRunner are examples of factory vehicles that have lockers back there, if I'm not mistaken.
FWD Lockable Differential 4506I think we're in violent agreement. A true locker would be pretty inappropriate for the front end of a pbuttenger car. Limited-slip, on the other hand, makes...
Anyway, the point is probably moot for front-wheel-drive pbuttenger cars -- hard to imagine why anybody would make, or want, a locker for one. True lockers in the front are for a hardcore subset of off-roaders.
Some front-wheel-drive pbuttenger cars are available with limited-slip, but that's probably best ordered from the factory than retrofitted. Dunno if a late-model Taurus, which presumably is in question here, had that option.
Cheers, --Joe