You can also look at the axle tube near the shock mount and there should be a tag that says “trac-lok”. Mine came with one and it’s decent for street use. Can get scary in snow/ice like any lsd.
I had my tracolok carrier rebuilt and it’s sitting in my garage, let me know if you want it.
That said I have 2 recommendations: for a cheap upgrade I would recommend the Detroit truetrac - a gear driven lsd that has a high bias and works almost as good as a locker off road. The second is the ox locker for the rear which is operated by a cable, not air lines like arb lockers.
There’s not really a locker available for the front d30a, but you can get a truetrac in the front and it works great. And FYI I run synthetic oil in the diffs.