I know most of you drive combos but would like to know if there is any double clutching on straight trucks as well?
Would they ask you to do this on the CDL B exam possibly?
I'm assuming most of these straight trucks are 6 speeds so I wasnt sure.

All of the class B straight trucks that I have driven (Freightliners, Intl, GMC) have had a 6-spd in them. They didn't require double clutching. I know a guy who runs for an expeditor (Class B) but he has a 9-spd in his freightliner and has to double clutch. So I guess it depends on the truck and tranny.

Doug

any Tandem (10 wheeler) or bigger uselly has a big trans like 10,13,18speed. so it is the same thing as a T/T.

All dump trucks will have at least a 8 or 9 speed heavy duty truck transmission.
Alot of them have 15 or 18 speeds too.
They may be class B, but alot of dump trucks haul more weight than alot of tractor trailers.
I gross out at about 85 000 lbs with my tri-axle dump truck.

Most of those 6 speed trucks are junk, they shift like crap. i would take a 9 or 10 speed any day over a crappy 6 or 7 speed light duty peice of crap.

If it's based on a medium duty chassis (Freightliner FL70, International 4000, GMC TopKick, etc), the transmissions are generally syncronized.

Kind i ask what state this is in that you can gross 85k on a tri axle :?:

Sorry i guess it's really closer to 77 000 lbs on a tri axle in ontario canada.
or about 35 000 kg

but if you got your axles spaced right i think it might be possible to be legal for 86 000 lbs, 20 on front axle, 20 on lift and 46 on rears.