I think its pneumatic, in the trucks anyway. In trucks, its actually a 1/2 gear in between. So you'll have 1st- hit the switch while still in 1st. Then you're at (technically) 1st and a half- hit the switch and shift to second and so on. Its actually a super-close close ratio. Used when you have a heavy load b/c sometimes (for eg.) 3rd may be to high of a gear and second is maxxed out so you need somthing in between...... gear splitter. Seems too much of a pain to shift- especially for a car. Its got to be slower.
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Julian
'74 Super
"If you are under control you're going too slow" - Parnelli Jones
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