Is there a visible way o practical way to know yo have LSD??

[jondee86]

AFAIK jacking up the rear end and turning the wheels is not a reliable
method of checking for a working LSD. The unit is designed to operate
as a normal differential until one wheel loses traction. So the diff will not
be "locked up" when you test it without load.

Better to do some sort of under load testing. Find a flat, sandy, loose dirt
or gravel surface... any low friction surface will do. Try a series of starts
with moderate acceleration from a standstill, with just enough power to
get the wheels spinning. Have someone watch (or study the wheel marks)
to see if one or both wheels are spinning.

If you can consistently spin just one wheel, then either you have a
standard non-LSD differential, or a LSD that is completely worn out

If you always get both wheels spinning at the same time, then you almost
certainly have a LSD To check with a bit more load, find a place
where (as suggested above) you can get one wheel on the loose stuff
and the other on tarmac. Use the clutch vigorously to spin the wheels

If both wheels spin the same, then you are good to go

Cheers... jondee86