Re: Fog Lights/Limited-Slip Differential--CVPI
Get the rear tires off the ground, park brake off and in neutral, then spin one rear tire and watch the other. If they both go the same direction it is a limited slip. If it has it and it's functional that's a good test. Usually there will also be a tag, held on by one of the cover bolts, that will tell you. Of course you could get the tires wet and lite 'em up. Two patches equal a limited slip.
I'm curious about the light question myself. I want to hang two high power driving lights and wonder if there is a factory set-up for my '00 Grand Mark. The stock lights, even on high beam don't really cut it for me.