That B-73 Mack 3-axle that I learned to drive on had a 262 Cummins engine and a TriPlex transmission, 5X3 in the same box, with two shifters for 15 forward speeds and 3 reverse ratios. We called driving it "Rowing it with the shift lever"!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!