Allison doesn't make an 18 speed transmission.
It shifts itself.
I want to see the shift patterns
I have a 1987 Pontiac Fiero GT and the shift pattern is: 1 3 5 2 4 R
allison 1000 if it is before 2006 (5 speed). in 2006 they switched to the 6 speed allison 2000
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.
It should have a 6 speed Transmission.
shift it foward
Allison 5 speed
Allison B500 6 speed
First gear down, the next four are pulled up.