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Heat fins are metal fins on the diff to dissapate heat. I don't know any other way to say it. Take a look at a subwoofer amp. Those are heat fins all over it.
I also think that you can see whether or not you have a rear LSD by reading the info on the door jamb, but I'm not sure about that.
In any event, why not just test the car? Jack the entire car up and spin one rear wheel. If the other one turns in the same direction, you have a LSD; if it turns in the opposite direction, you don't.
- Jtoby
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