Okay, I decided to go back out and try something different. If I jack up the front end so that both tires are off the ground, just the car into first gear and then turn one of the front tires the other tire turns in the opposite direction. If the car is in neutral (as it was in my first test above), the only tire that spins is the one that I am turning.

If I jack one side of the car up (so that one front tire is on the ground and one tire is off the ground), put the car in first gear and try to turn the raised tire it won't move. I hope that helps, Eric.

So in conclusion, Type R 801 is right on the money. One tire has to be on the ground to verify if a differential is installed.