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Learning all this stuff and getting it down pat is really hard. It's more of a dance than a science.
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I totally agree...I dont like to say its "really hard" but more of a learning
curve, that can be quite challenging. Many variables can determine
when a shift is needed, whether its an upshift or downshift.
Rules of Thumb may be helpful during inital learning but the variables of
of "real world" application will greatly vary the rules of thumb.
With considerable practice and learning of the sounds of the engine and
the motion of the truck you will learn to shift without the use of the tach
or speedo.
One think that is a constant the engine rpm must "match" the roadspeed
for any particular gear that is to be selected, whether upshifting or
downshifting.
It really takes alot of practice. Always be aware of your roadspeed either
by observing the speedo or by motion, and be aware of the rpm of the
engine by observing the tach or engine sound