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I grew up on a 5 + 4 Mack Quadruplex. Freightrain is correct about one thing; save the "split-shifting" with 2 hands till you get used to it! But, you don't necessarily shift the MAIN first. UPSHIFT whichever box you need to shift first, then DOWNSHIFT the other. If you try to downshift the main first, for example, you probably won't have enough RPM to do so. And, if you can, there's really no need to split-shift. I can give you a couple of different patterns to use. There is also a slight difference between an 18-speed and a 20-speed. Since the Hi-Split and 5th geear are both overdriv

Thanks Barry for supplying this vital information. mike

great help !!