Fluid drive is just what the name says it is.
The inside of the fluid unit is filled with an oil, and there's an impeller, spun by the motor. The walls of the unit have ribs inside, and as the impeller spins, it flings the oil around, spinning the outside shell, which has the drive pulley mounted on it.
Ok, I can't figure out how it stops spinning
Anyway, it's much like the Chrysler 'fluid drive' cars of the 40's, or like the early Hydramatic car transmission.
It's NOT like a torque converter, but it IS the direct ancestor to them. A TC has one other element, a stator.
The inside of the fluid unit is filled with an oil, and there's an impeller, spun by the motor. The walls of the unit have ribs inside, and as the impeller spins, it flings the oil around, spinning the outside shell, which has the drive pulley mounted on it.
Ok, I can't figure out how it stops spinning

Anyway, it's much like the Chrysler 'fluid drive' cars of the 40's, or like the early Hydramatic car transmission.
It's NOT like a torque converter, but it IS the direct ancestor to them. A TC has one other element, a stator.