So I'd guess the granny low is 1, and generally you just drive it as a four speed, starting out in second?
Also, since this has an overdrive, how does it bolt up compared to an SM420 which just kinda dangles off the back of the bell housing on a 1965 C60? I'd really like to have an overdrive so I don't have to buzz the big Cadillac V8 so high just to go 65mph.
