You did mention about seeing the flat spot on one side but I just wanted to confirm that you are working with a 69 rear. No need to look at pictures on the internet to know if 4 Pinion. Just look in the carrier window and count the gears. In your pictures above the axle you can see them in the third and fourth pictures they are the little gears in the center of carrier. as mentioned some people call them spider gears. The side gears are to the side and the axles go through them. What I see in your pictures is a 4 Pinion but just want you to confirm in person. the 4 Pinion gears are on something that looks like the center cross part of a u-joint in the center of the carrier. How much snow did you get? I got a foot at the house and 25 minutes west in the Berkshire mountains where I mostly snowmobile we ended up with almost 2 feet.