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 Post subject: Twin stick transmission
PostPosted: Sat Jul 07, 2007 7:30 pm 
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How does a twin stick transmission work on a truck? Is it two transmissions mated to each other?


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PostPosted: Sat Jul 07, 2007 7:54 pm 
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I never seen it for myself, but my guess is there are 2 gearboxes. 1 gearbox is like a normal one on a car, and its output shaft is the input shaft of the 2nd gear box. So if the 1st box has 5 gears, and 2nd box has 3 gears, you have a total of 15 speeds to select from.

It's like a bicycle with derailleurs on both the front and rear sprockets. My bike has 3 in front and 7 in the rear, giving a total of 21 combinations. A lot of these combinations actually overlap. It's useless to have overlapping speeds, so on the truck in my example above the 2nd gearbox should have 3 gears that are far apart enough.

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PostPosted: Sat Jul 07, 2007 9:11 pm 
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My dad used to drive a mack truck with two shifters. It was ridiculous, sometimes you'd have to shift both at the same time and they were far apart, not an easy task. I think now most new trucks use buttons/levers on a single shifter instead of dual shifters.

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PostPosted: Sun Jul 08, 2007 12:40 am 
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http://youtube.com/watch?v=w-ffkS37miQ
Holy crap :P

http://youtube.com/watch?v=xAADEoJpTFQ
Lol double clutching


I liked the freightliner argosy till I saw this:
http://youtube.com/watch?v=f6rB_HnIYzw


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 Post subject:
PostPosted: Sun Jul 08, 2007 3:16 am 
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In the B model Mack video it seems that the driver is using the sticks in a serialized fashion, not at the same time. It also looks like the driver floats both sticks, that is doesn't use the clutch.

The International driver keeps his left hand on the steering wheel. In the beginning he floats the long shifter.

I didn't know there were two stick vehicles until I saw this. In never transmissions the range and splitter are operated conveniently with two switches on one stick. From a product development viewpoint it seems logical.

And of course the newest transmissions are fully automatic as seen in the Australian tractor.


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 Post subject:
PostPosted: Mon Jul 09, 2007 11:43 pm 
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wow, that is pretty sweet. I want one of those


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PostPosted: Mon Jul 16, 2007 4:47 pm 
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Not related to the truck shifting, but I saw an old GTO advertised with a his and hers shifter. Anyone know what that one is ?

ekincam wrote:
How does a twin stick transmission work on a truck? Is it two transmissions mated to each other?


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PostPosted: Mon Jul 16, 2007 5:33 pm 
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Bill B wrote:
Not related to the truck shifting, but I saw an old GTO advertised with a his and hers shifter. Anyone know what that one is ?

yea, his shifter is the gear shifter
her shifter is his dick

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 Post subject:
PostPosted: Tue Jul 17, 2007 10:28 am 
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LOL. On the second youtube video, I saw this comment:

idiot wrote:
Good hell, that sounds like an old gas eater to me! Whats it got, a big six Oshkosh gasser? I hear bangin, poppin and backfirin! Sounds great!haha!


The guy probably thought that the double clutching meant that the engine was malfunctioning or something :)


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 Post subject:
PostPosted: Wed Jul 18, 2007 10:52 pm 
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My dad has a Ford Aeromax semi. It has a dual stick like setup in which when you go through the first 6 gears, you flip a switch and you get an additional six gears. Bad thing is though, you have to downshift through each gear you traveled through.

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 Post subject:
PostPosted: Wed Jul 18, 2007 11:38 pm 
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Pinky Demon wrote:
My dad has a Ford Aeromax semi. It has a dual stick like setup in which when you go through the first 6 gears, you flip a switch and you get an additional six gears. Bad thing is though, you have to downshift through each gear you traveled through.

why is that? why can't you just clutch in and coast or just block downshift? :?

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 Post subject:
PostPosted: Thu Jul 19, 2007 12:49 am 
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cuz big diesels dont have a lot of powerband to block shift thru. downshifting one gear will put it close to the redline.

jumping gears would result in mechanical overrev

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