Originally Posted by imlowr2

If its out of a 70 F100, the number you posted doesn't make sense. The C5AW would mean it came out of a 1965 Model, maybe a truck? If the 3rd member has a tag on it, you can see what gearing is in it and other information. Should say 3.73 or 3.50 or?? If not, you can make a mark on the yoke of the 3rd member. The turn the lug on the wheel, one complete turn or 360 degrees, and count how many times the yoke went around. If it went around 3 and half turns to your one revolution, you probably have 3.50 gears. If it goes 3 turns, they are 3.00 etc etc... Not sure on the holes and dimple on the axles? The holes are standard and used for or with the socket to align with the axle flange bolts, so you and remove them and pull the axle out. The pictures don't really show much on what type of rearend it is. Maybe you can post more?