Todorado,
There are plenty of threads out there and probably some good info in the FAQs (which might be how you arrived at this thread

) but I'll add this info since it is a linked FAQ thread.
For
FACTORY lockers, here are the FOUR things I suggest you do to verify if an 80/LX450 has them and that they work:
- Check for the magic dial either in person or via a close up photo of the area
- Rotary switch, immediately to the left of steering wheel
- Dial says "Diff Lock" on it with off, RR, and FR-RR positions/selections (see pic)
- Check the Data/VIN tag on the lower portion of the Driver's door either in person or via a close up photo of it (see pic)
- K292 = NON locking axles (from factory)
- K294 = Locking axles (from factory)
- Check the axles for the locker actuators either in person or via a close up photo (see earlier post)
- VERIFY that the lockers work (hopefully in person)
- Find a dirt/gravel/etc. road or area
- Put the 80 in park or neutral
- Shift the center diff (tcase) into Low
- Verify the CDL engaged and the ABS is off (may have to drive forward a little)
- CDL icon should light - below the left side of the tach
- ABS icon should light - below the temp gauge
- Turn the magic dial to lock the axles - Either one at a time or both at once
- Diff lock icons on the dash should light - right side, below the speedometer, to the left of the "Open door" indicator
- Icons should blink while the lockers are trying to engage. They will light steadily when engaged
- If lockers don't engage, try some SLOW tight turns or figure 8s
- If the lockers STILL won't engage (sometimes it can take awhile if they aren't 'exercised' regularly) then that could be an expensive fix - sometimes they just need to be cleaned up and other times the entire actuator needs to be replaced ($$$)
Of course there are always exceptions to the above. It is possible that a rig came locked from the factory and then had parts removed (as mentioned above) but that rig won't pass test #4. On the other side, it IS possible to swap factory locking axles into an originally non-locked rig and the only difference is that the tag won't reflect that (test #2). And of course there is always the aftermarket locker mod (ARB etc)