First gear down, the next four are pulled up.
I want to see the shift patterns
Allison doesn't make an 18 speed transmission.
1 down and 5 up is traditional, however if its equipped with a GP shifter, it will be 1 up and 5 down
Between 1st and 2nd gear.
you can on most, but it is harder on the transmission than downshifting as speed decreases.
I have a 1987 Pontiac Fiero GT and the shift pattern is: 1 3 5 2 4 R
Same shift pattern as a 9 speed. Youtube has a great video straight from eaton fuller on it that would be better than me typing it.
Four speed transmission is : one down, three up.
It's a nine speed transmission, so see the related link for a diagram. The diagram is actually of a 13 speed transmission - the difference with the nine speed is that it doesn't have the High/Low settings for the top side. The nine speed "H" pattern is the same basic pattern used for the 8LL, 13, and 18 speed transmissions.
shift it foward
Suzuki T20
The speed sensor sends a signal to the speedometer to show the correct speed and it sends a signal to the transmission telling when to shift. If the speed sensor is bad the speedometer will not work and the transmission will not shift correctly.