W/r/t GV
Yes, but:
$$$$
OD is only 77.8%
Has less effect on engine speed than any of the factory transmissions but can be used in any gear. This has the effect of “splitting the gears”, viz. creating an intermediate ratio between each pair of the original gear ratios.
It allows double overdrive with an OD box.

I wrote an .xls that shows various ratio combination, RPM loss, MPH in gear, etc., PM for a free copy