Double Clutch.

[Fernando Mendes]

""SHIFTING TRANSMISSION INTO LOWER SPEED:Transmission should always be shifted to next lower speed before engine begins to labor or before vehicle speed is reduced appreciably.Shifting into lower transmission gear ratios is best accomplished by using the "DOUBLE CLUTCH" method.This is done as follow:
1.Depress clutch pedal and release accelerator pedal at same instant.
2.Move transmission gear shift lever into neutral position.
3.Release clutch pedal and accelerate engine to syncronize gears.
4.Depress clutch pedal again and move shift lever(do not apply excessive pressure) into next low speed position.
5.Then release clutch and accelerate engine to obtain desired road speed.
In general ,it is advisable to use the same transmission speed going down hill as would be required to climb the same hill."" Page D-8 TM10-1563.

[dr deuce]

You use the "down shifting technique" to go up to 5th

[Fernando Mendes]

Excuse me,but I don't know what it is this technique.But I want to know.

[dr deuce]

"DOUBLE CLUTCH" method for 5th from 4th.This is done as follow:
1.Depress clutch pedal and release accelerator pedal at same instant.
2.Move transmission gear shift lever into neutral position.
3.Release clutch pedal and accelerate engine to syncronize gears.
4.Depress clutch pedal again and move shift lever(do not apply excessive pressure) into next low speed position.
5.Then release clutch and accelerate engine to obtain desired road speed.

Going into 5th OD is like downshifting

[Chris_M]

Do you really need to doubleclutch when shifting up (no matter which gear)? I never do this. Even when shifting from 4th to 5th. This works fine and smooth with my truck. Of course, when shifting down, I have to doubleclutch. Timing needs some practice. I drove three different CCKWs up to now and every vehicle behaves different. Very interesting. Our trucks are all individuals.

Regards,

Chris

[Fernando Mendes]

On page D-8 from the TM10-1563 only says "........INTO LOWER SPEED".

[Chris_M]

I found this in TM 9-801, page 39 (April 1944 version):

(3) After necessary road speed has been obtained in first speed,
release accelerator pedal, depress clutch pedal, and place transmission
into second speed position. Release clutch pedal and accelerate
to proper road speed and repeat operations for third, fourth, and
fifth speeds-in successive stages.

Regards,

Chris

[Fernando Mendes]

Ok Chris we are right.Thanks for your help.Did you ever seem my messages? I knew this week ago about silicone(DOT-3 and 5) brake fluid that causes condensation,DOT-4 not causes.

[dr deuce]

You can tell someone who has driven a CCKW by them giving it gas going into 5th

At lower shifting speeds, you "can" shift w/o double clutching. You "can" also shift w/o using the clutch all together. Big truck drivers do this.

Double-clutching is an art that is "learned" from driving...

[Chris_M]

I love "double clutching". There are so many people who don't know this way of driving (except vintage vehicle owners). Here in europe the majority is used to manual shifting. Cars with automatic shifting are a minority but when they ask me on shows or events how it feels to drive this truck, I always see big eyes on them, when telling about double clutching.

@Fernando: I use DOT-4 and replace it every 2 years. So condensation is nothing to worry about.

Regards,

Chris

[Fernando Mendes]

Ok dr. Deuce and Chris.I want to congratulate you,that are the only two guys that really like to answer our questions along this year,it is because you love this subject.Want to desire too a happy christmas and a happy new year for you and your familly.

[Nick Bombini]

I tried shifting without using the clutch once but got the timing horribly wrong and ended up grinding until I depressed the clutch. I haven't tried it again since. I am able to shift without the clutch in my pickup all day long without any problems so I think it's time I try it again with the CCKW.

As for shifting into 5th gear, I doubleclutch up like the rest of the gears and have never had a problem getting it into gear without grinding. I've driven a couple of other trucks and agree that each truck feels, shifts, drives a little bit different.

--Nick

[dr deuce]

Your PU truck has synchronizers in the transmission which will prevent engagement till the speeds are almost perfectly matched.

The CCKW has no such feature. That is why you double clutch