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Mack twin stick transmission.
The 10 speed was even better.
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This guy is a boss.
Prepare to be mesmerized watching a man use both hands to shift two sticks through nine gears while double clutching in an old mack truck.
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A relatively simple transmission to sort out the taller stick.
1952 lj mack with cummins engine and a triplex transmission.
Shortly after i got my lisence i used to drive big ole mack tandem axle gasoline dump trucks that had a 20 speed compound shift with twin sticks.
Models include t2090 t2070 t2050 t2180 t310 t2060 t2080 t2100 x107 and x1071.
It wasn t all that bad once you got used to it.
Hell lots of trucks now have completely automated manual transmissions where the clutch action is handled by a computer as is the shifting.