Yes David,
'63 Riv is listed at least on Wiki as having either or both. They also may have had a mid model year change when the hydro 400 was ready. The twin turbine was an aka "turboglide" design, but was marketed as a dynaflow. The third forward speed was actually achieved by the variable pitch torque convertor vanes. Low gear said "hill retard" in the selector quadrant.
What a beautifull machine. Clear trough the '74 model year. I never like the colonade style much. Not on the Riv.
The boat tails from'71 through '73 are very popular in the Netherlands and Germany.
With a high front wheel caster angle, and larger brakes, they were the least stodgy handling of Big GM cars.
Oh, there was also a 2 speed roto-hydramatic from 1958 to '63. It had a fluid coupling, not a torque convertor. It had both a front and rear pump as well, but emptied the entire sump of fluid between first and second gear to the rear section.
First gear was very long drawn out, and you knew it when second engaged with a rather dull slam. I think smaller V8's used it.