You lost me with the 1:1 final on V730.
Yup, that's a common thing with the V-730. Lots of folk confuse the 3rd gear ratio with the (3rd x Bevel) ratio, but 3rd is actually 1:1. Same as an HT-740.
I'll try to find my V-730 sales brochure that has the specs and scan it for you.
I'm not well-versed on the various torque converter ratios, but I can quickly see were in "unlocked" mode the torque multiplication can be significant between the different models.
Speaking of unlocked, the shift sequence on a V-730 is 1C-2C-2L-3L. Which is another thing that confuses folk not familiar with them - they think it's a 4-spd because the 2C-2L feels like a shift.
FWIW & HTH. . .
(Wow. . . Talk about thread drift!)