what version has LSD?

I've just changed fron an XE frontier 01 to an SE X 01. Everything that wasn't nailed down is missing so I'm not sure if it has the LSD or not. The frontier did.
Can anyone offer any visual clues as to what to look for or what else was installed on an LSD equipped X SE?.
It has a tow hitch and 6cd if that helps any.
thanks one and all.

If it's an SE it has the LSD.

To test if its still in there (I'm sure it is):

1-Lift both rear wheels off the ground
2-turn one wheel by hand, make sure the parking brake is off and its in neutral, not park.
3-If both wheels turn the same direction then its got an LSD, if the other wheel turns the other direction then its open.

there is an easier way to tell an LSD diff. Look at the diff itself. If the bolts going around the diff face the front, it's LSD. At least that's my understanding.

Nope, all the housings are the same, and use a 3rd member.

If there is a sticker that says LSD Oil Only on it, then it has a limited slip.

I should've looked before I asked!
There's an orange LSD Oil only sticker on there.
Thanks for all the replies.