Phew, that's what made sense to me.... 4 gears, OD = Over Drive.No, not a regional thing. It's the way one of the twerps on Trucks! said it that's just sticking around like scum in the bathtub.
It stands for Electronic 4-speed Over Drive. There is no "40" in the name, it's not a gm transmission.
You are saying it correctly.