Mack built a Maxitorque Duplex that had the main and compound boxes in one case and two sticks. I had one in a V-8 Mack. This transmission was also referred to as a six-speed. (The six-speed nomenclature was propagated by Mack owners who had a hired driver and did not want them splitting the compound!) The main box had five gears and neutral, the compound had high, low, reverse and neutral. The PTO speed was controlled by the main box. The compound box had to be in neutral to run the PTO if you were dumping and not moving forward. I burned up the pump on my wetkit running the PTO too fast with cold hydraulic oil. I drove mine like a five-speed unless I was loaded in the hills. Then I could split the compound and only drop half a gear. This transmission and the 375 V-8 made a formidable combination for a grain hauler, running both on and off the road. The weak spot in the driveline was the u-joint yokes. The truck had so much torque and gearing that the driveline would not hold it if you got careless with the clutch in soft ground. That old V-8 Mack was governed at 2200 rpm, good for 72 mph. Loaded or empty it ran 72 mph. That was the steadiest truck I ever drove. The limit to this truck on the road was the pyrometer. The only time I used the clutch in a Mack was to get the truck moving. Mack transmissions were designed to be power shifted. Most non-Mack drivers tried to clutch one and had problems changing gears. If you got the road speed and engine speed right, the trans would suck the stick into the right gear. It was hard to miss a gear in a Mack. You could lug the engine down to 1200 rpm (Maxidyne turbocharged engines) before you had to downshift, so you had lots of time to get to the next gear. Not as much fun as driving a 335 Cummins with a 13-speed Roadranger, but it was easy to get used to. My wife drove my old Mack when I got in a bind.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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