Your tranny was called the "quad mod". 4 powershifts in each of 4 ranges, for a total of 16 speeds. It is of Ford design and manufacture. It is also called a "partial powershift", as opposed to a "full powershift" or simply "powershift" of the 18-speed Funk.
If you look carefully, you'll find the Ford oval cast into the side of your tranny case. No such logo exists on the Funk 18-speed trannies.