Hard to say, the only thing 3rd and 4th have to do with the input shaft is the 4th and 5th sliding gear locks on to the input shaft for 5th gear. When 3rd and 4th speeds are changed in those transmissions the 3rd and 4th drive gear on lower shaft is changed along with the 2&3 and 4&5 slider gears on upper shaft. Faster 3&4 can come from W-6, I-6, old aftermarket or new gears made, or something I haven't heard about. IH made a faster 4th for M tractors. Faster input and constant mesh gears would speed up all gears.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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