Our Allison transmission has 6 gears. I always took that at face value. Our Aladdin system has a digital display that shows what gear the transmission is in. I can watch it shift from 1 through 6. There is a letter that follows every gear; the letter “L”. I took that to mean “Low”, and that maybe some heavier duty version of the transmission, for a bigger rig or maybe a semi truck-tractor, has a “High” range to go with the Low range. But driving on a slow steep winding road to a campground, when first gear wasn’t quite getting it, I noticed that the transmission downshifted. It downshifted from 1st gear Low, to…. …what? I switched over to the digital display to watch while I messed with hills and gears and figured out that there are two more gears than I knew about. There is 1st gear “C” and 2nd gear “C”. If terminology I remember from my youth still applies, that would be a compound low for first gear and second gear. Our six speed transmission has eight different gears.
Who knew?