One neat trick that Sparky is doing, is using the gear vendors as the first shift. The car will take off in first and then the first shift will be the gear vendors resulting in a 22% drop between 1st to the gear vendors shift (we will call this second gear). After that the transmission alone will be used for the remaining shifts with the gear vendors left in overdrive.
This will allow all the shifts to be smaller and smaller drops with the last being about 9% between 5th and 6th (5 transmission ratios and the one gear vendors for 6 speeds). Most would use the gear vendors as the last shift but then you would have a 22% drop and one that large wouldn't be good at that point in the run.
The gear vendors is locked in at a 22% reduction. All the other gears in the transmission can be set at about any ratio desired, which allows progressive smaller and smaller drops in rpm's with each subsequent shift.
How he is going to manage the clutch to cut down on drive-line shock is another whole topic
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Sumner