[mustangman65_79]

Ok, this has pundered me for a while. On my '66 mustang, w/ a c4 crusie-o-matic, 3-speed, why is there two drives? The only diff I can see is the upper one starts out in second gear, and the lower one starts out in first. Why is there two, and is there any more diff between the two rather then starting out in diff gears?

I know the lowest one is to stay in first or second, which I use to race out the gears.