Hyup you got it.
That sixth gear is pretty pricey. and like you say, to properly use it, you gotta be cruising High speed. .
I followed a Corvette in 2004, coming home from Minneapolis. He blew by me, as I was doing 75 on the Interstate. Well, said I, I bet he has a radar detector. So I let him get up on the horizon, and that is where we trucked along. With my A833od and GVod behind it; 100 maths to 2440.
But I no longer use that combo. These days I run the Commando 3.09 low box still with the GVod.. One overdrive is enough.