Some do, some don't. I believe it was a factory option. I have a 2000 with the 30/35 combo, and 3.73 gears, and mine does have the trak-lock, so I use a friction modifier in the rear only, along with oil for limited slips. I'm not sure if the trak-lock came on all 3.73s or not. If you're not in a hurry you can always request a free build sheet and see what it says. The tag on the axle MIGHT say if you have it or not too. I'll go check mine and see if it does.
YELLOW Jeep Club Member #5606
13 mpg - edit: 12 mpg
No hi-lift on the hood (yet)
Still can't get it to take off from a treadmill....