I had a International crew carrier when I ran grade crews..
It was a 6 gear with a split shift..so essentially 12 gears..a high n low for each gear..
The older Vietnam vet I worked with made sure that he taught me how to drive it when I got my class b with air brakes n passenger enforcement because it made me more valuable as a employee to be one of the few who could drive it.
So when it was time to hire someone to run the crews and train the new folks and the only rig not being used was the international..I was a shoe in. And the great part was it was my crews rig when I first started as a wee lass..so I felt I came full circle driving my riggy I'd rode in 4 years prior as a new gal on the crews..
Now Riggy was mine..and I could shift that gal on RPMs without the clutch..just got the feels for her n it was on..I loved that rig!