I don't know the series, but I had a cab over, 1979 International tractor, dual driven tandems, Big Cam 400 hp (must have been an 855 cu in with a turbo) Cummins), 15 speed tranny (Rochester or something like it comes to mind....excellent tranny) with a 36' end dump rock bucket behind it.
Power band was 300 RPM and 15 speed kept you in the torque range constantly....clutch only when stopped, once going, touching the shifter with a tad of pressure lining the shifter up on the next shifting spot, and getting the engine RPMs at the right spot, (usually just let off the pedal and as the RPMs fell and the gear train lined up), the lever would just slide into the next gear and you were good for another 300 RPMs.
It did have enough power to twist the drive shaft off once. Pulling up out of a sand pit with a full load in the winter with the sand/clay mushy does put a strain on the drive train. Excellent engine.
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