Ya, my friends dad is a truck driver. He said that he pushs in the clutch once to shift more than oone gear, hence the double clutching. IDK, maybe he does it the right way.

"First, you take your foot off the gas and kick in the clutch. You shift into neutral, AND let the clutch out. You wait perhaps 0.3 to 1.0 seconds for the engine to slow down from its high revs, depending on how fast you were revving when you started to shift and how much inertia the engine has to slow down. THEN you kick in the clutch and shift into third, and let the clutch out quickly, feeding the gas appropriately. If you have judged it right, when you let the clutch out, there isn't any JERK. And when you shove the lever into third, the gears and engine are at a synchronized speed, so there's minimum wear on the synchronizers, which are the tiny clutches that bring the clutch plate and the gears into smooth synchrony. There's also usually less wear on the clutch plates."

 

And when you shove the lever into third, the gears and engine are at a synchronized speed, so there's minimum wear on the synchronizers, which are the tiny clutches that bring the clutch plate and the gears into smooth synchrony. There's also usually less wear on the clutch plates."
[/quote]


um there are NO syncros in a big rig trans ,and IF there are any the only place they are located at is in the "back-half" of the trans (this depends on which brand and how many speeds they Trans has) and those syncros are used when appling the air valve to "split" the gears from Low range to High range.

not try'n to bust ***** here but I worked for Werner Ent. for about two years repairing their trucks( thats where i was driving them,lol) i still drive them for a Company out here in Hawaii but it isnt very often anymore im working more time at my other job,lol. Also went to Arizona Automotive Institute for 2 yrs to be a Auto/Diesel Tech did alot of trans overhauling in there lol both Auto and Heavy truck.

BTW- a Semi's trans has three shafts in it not just two, Auto has a Main and a Cluster shaft, to where a Semi trans has TWO Cluster shafts and One Main shaft, just my $0.02 like i said not busting ***** here just stating some info thats all,but take it how you want to i guess, i cant stop ya from it,lol

 

the first couple races, it looked like the camaro snuck up beeped 3 times quickly n left

 

Werd.

 

Saleen still got purty points. [sm=smiley20.gif]