Does a 2000 Ford Mustang v6 automatic rear wheel drive have positive traction?

The V6 Mustangs were not offered from the factory with a limited slip rear differential. That option was for the V8 models. That's not to say you or someone else couldn't install one. Chock the front tires to prevent rolling, jack up the rear of the car so both back tires are off the ground. Put the car in Nuetral and spin one of the rear wheels. If the other tire spins the same direction, you have traction-loc or limited slip. If it spins opposite, you don't.