OD trans

Agree. Same with the 500 and 518 trannys. They are 4-spd trannys, not 3-spd with overdrive. A 727 with a GV OD is a 3 spd with OD. With that setup you 1st and 1st in OD. With the 518 and 833OD you don't.
So would you call it four speed with overdrive if it is a 4 speed transmission and one of the four gears is an overdrive? Or what would you call that?