Posted by Bob M on January 21, 2008 at 09:47:13 from (151.190.254.108):
In Reply to: IH 1800 truck posted by Al Epp Waldorf Md on January 21, 2008 at 04:40:25:
Al - Unlike a modern car or light truck, both those transmissions on your truck are unsynchronized. Means you must either double clutch or �float shift� (change gears without using the clutch) in order to change gears without grinding.
These techniques are not difficult to learn. But it does take a bit of practice to get it right.
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The purpose of the aux 3 speed is to divide or �split� each relatively widely spaced gear on the main transmission into 3 more closely spaced gears. When properly shifted this keeps the engine RPM very near the engine�s maximum power point as the truck accelerates. This then gives the best acceleration for a heavily loaded truck. It also eliminates low RPM lugging strain on the engine � though at the expense of increased �strain� on the operator(!)
Like Rusty suggests simply leave the aux 3 speed in OD and shift just the 5 speed. Only with the truck loaded do you really need to use the aux.
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A good video of an experienced driver float shifting twin stick being can be found at the link below.
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