and the splits are 60%-63%-80%
I am delighted to see an alternative selection, but I don't see this as a solution to everybody's problem. If you build your engine to work with these ratios, it can be a good alternative.
These ratios would work with an engine that likes to be shifted between 5000 and 6000, thus having a powerband requirement of 2000 to 2400 rpm. That's doable. Say a stout teener or a stockish 360, or any engine tuned to favor torque in the lower Rs
But if your engine wants to be shifted at 7000,thus professing a power peak around 6000, the Rs will drop(2nd) to4410; and the powerband requirement will be 7000 - 4410 = 2590. That's a bit of a stretch, cuz it's a long haul to where the power is. But the next gear is way too close and if it can take full power/torque (I don't know that it can), then you can outshift 3rd at around 6700, to drop in at 5360( to center the run on the powerpeak) That might trap ok. But it has to to, make up for the big early splits.
So in my mind these ratios are more suited to a DD, and are only a little better than the Chrysler O/D box (with %splits of 54-60-73). But if the od gear can take the heat then that would be a big bonus. Especially for guys like me that might forget what box they're shifting this week!
As for me I would prefer what I already have.
