Jes give me my 13 over 2 way splitter dragin' ah 53'r and I'll parallel park it for yeah or don't talk tah me!!!!!!!!!!!!!!!!!!!!!!
OK you truckers...
- Thread starter 300rag
- Start date
What in the world? My head will explode if you guys say he did that "clutchless".
seriously .. can anyone explain that ... from a technical logic standpoint .. as if I was a four year old? I can look it up but still would need a translator
hands off the wheel to shift? downshifting? emergency manuevers? one of the most complex patterns ever? what a SOB to drive as it seems?
Anyway, Mack B series, 1953-1966 models, Wikipedia says they had 5x3 ("triplex") and 5x4 ("quadraplex" - WTF!!) trannies too.
Generic photo below since I never heard of the truck at all. "Now dat's a real truck right dair."
5x4 quadruplex Mack.
this guy threads his arm through the steering wheel, when using two hands to shift. and he doesnt seem to be using the clutch. Ay Caramba!!
this guy threads his arm through the steering wheel, when using two hands to shift. and he doesnt seem to be using the clutch. Ay Caramba!!
I had to see this "freak of nature" transmission.
source: Mack quadruplex, 20/18 speed, transmisson, NOS, stampedTRQ7220, 1P1173, 11KBA5648, AP61 (Left side)
source: Mack quadruplex, 20/18 speed, transmisson, NOS, stampedTRQ7220, 1P1173, 11KBA5648, AP61 (Left side)
commando1
Old Man with a Hat
Who the hell uses a cluch? 
(except in a Maxi-Torque five speed which sucked).
(except in a Maxi-Torque five speed which sucked).
AHHHH? WHATZ AH CLUTCH? LOL
Who the hell uses a cluch?
I was pokin' fun at myself.
Couple years ago i started a thread called "in the clutch" ..or not" where u guys weighed in at length on my questions on that technique ..even in ur cars..
In the Clutch..or Not
Anyway i heard some "grinding" in the 5x3 vid ..prompted the question again.
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commando1
Old Man with a Hat
Never seen anyone who doesn't grind the gears on those transmissions.
The way to get it into the next gear is to "rub" the two engaging gears against each other as you move the shift lever with a feather touch. When the turning speed of the two gears are in synch, they literally slide into place. The more miles on the box the better.
twostick
Senior Member
What in the world? My head will explode if you guys say he did that "clutchless".
seriously .. can anyone explain that ... from a technical logic standpoint .. as if I was a four year old? I can look it up but still would need a translator
hands off the wheel to shift? downshifting? emergency manuevers? one of the most complex patterns ever? what a SOB to drive as it seems?
Anyway, Mack B series, 1953-1966 models, Wikipedia says they had 5x3 ("triplex") and 5x4 ("quadraplex" - WTF!!) trannies too.
Generic photo below since I never heard of the truck at all. "Now dat's a real truck right dair."
View attachment 152114
First and last good looking truck Mack ever built!
Kevin
70bigblockdodge
Old Man with a Hat
There is no synchronizers in a big truck transmission. They would not last anywhere near the miles you can get out of a box (think 1million plus). All the gears are straight cut and the speed dogs and gears are all square cut, not pointed as in a A833 for example. Even if you use the clutch to shift you have to double clutch or engage it as you pass through neutral to slow the speed of the input shaft and the clusters matching the speed and being able to select the next gear. This is all happening with only 3-500 rpm swings, you kind of get the "feel for it". So since you have to engage the clutch as you pass through neutral it is just easier to pull it out of gear as you let out of the fuel and then wait till RPMs drop and stick it into the next gear.
Downshifting is opposite, you have to raise RPM in neutral to match next lower gear, again you get a feel for it.
The 15 speed in my truck basically works the same way as the triplex except I just have small air switches that shift the ranges not a whole extra lever. The deepest reduction is not used all the time, reverse, manuvering heavy load on a hill start etc..
Hope that helps a little.
Downshifting is opposite, you have to raise RPM in neutral to match next lower gear, again you get a feel for it.
The 15 speed in my truck basically works the same way as the triplex except I just have small air switches that shift the ranges not a whole extra lever. The deepest reduction is not used all the time, reverse, manuvering heavy load on a hill start etc..
Hope that helps a little.
commando1
Old Man with a Hat
I know and I never said anything about there being synchros. I was saying by letting up on the throttle while applying a light pressure on the handle, you could literally slide it out of gear. Then in that sweet spot of Neutral, you raise the rpms and apply a slight pressure to go into the next gear up. As the rpms go up, the gears literally slide in place when they match. You read the feel through your hand.
I played around with this on a T10 in a bowtie as a kid... But I never got to work it on a real truck. The hand work of multiple shifters does look intimidating, but I bet it's not so bad once you know the patterns. Bet you guys driving these can't draw and H right anymore without effort.
On the other hand... my shoulders are sore just watching those guys shift.
On the other hand... my shoulders are sore just watching those guys shift.
72Fury
Senior Member
70bigblockdodge
Old Man with a Hat
Yes you are the synchronizer.
And I might add that pulling away from light you can march right through the gears but if something upsets the rhythm you miss a gear and have to work to get it in something.
commando1
Old Man with a Hat
I am one with my truck...
300rag
It's Not Going to Shift Itself
One what?I am one with my truck...
guys .. three last questions from me then i'm done with this topic.
Forgive my ignorance, i aint dissin' drivers or their trucks, and appreciate the help.
1. threading your arm through the steering wheel to steer while using TWO hands to shift. The designers knew this OR is this the way people in field learned was best to operate the vehicle? Is that safe?
2. do you know/feel things so precisely that you could shift from say 10th gear to 7th (or whatever else you may need to do) in the ordinary course of driving?
3. on 2 above, in a hypothectical "emergency", what if you need to make a simultaneous evasive steering maneuver while shifting gears (e.g., to use engine to aid braking perhaps)?
OR, is it both hands on wheel, foot on brake (and clutch to prevent a stall?), and forget about any gear shifting?
Update: Jacobs Brake Systems -- Jake's Brakes.
How An Engine Brake Works
here's another B61 for your trouble
Forgive my ignorance, i aint dissin' drivers or their trucks, and appreciate the help.
1. threading your arm through the steering wheel to steer while using TWO hands to shift. The designers knew this OR is this the way people in field learned was best to operate the vehicle? Is that safe?
2. do you know/feel things so precisely that you could shift from say 10th gear to 7th (or whatever else you may need to do) in the ordinary course of driving?
3. on 2 above, in a hypothectical "emergency", what if you need to make a simultaneous evasive steering maneuver while shifting gears (e.g., to use engine to aid braking perhaps)?
OR, is it both hands on wheel, foot on brake (and clutch to prevent a stall?), and forget about any gear shifting?
Update: Jacobs Brake Systems -- Jake's Brakes.
How An Engine Brake Works
here's another B61 for your trouble
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#1- The two stick transmissions were ALL designed for using one hand obviously while steering with the other. It's a time delay thing that involves a hesitation timed to RPM change and it just works better and smoother with your left arm between the spokes, and it's a closer grab to the wheel if need be. #2 It's called "jump shifting" and yes NO BIG DEAL and in most instances done while deadheading (no load, much soother and less strain on the drive train) #3- One of the first things you learn if you're gonna sit in one of those chairs is to look as far down the road as you can and use peripheral vision to its fullest extent to the point of using shadows on both sides and behind you, CONSTANTLY. #3 1/2- Jake Breaks ie; Engine Breaks, are a whole different issue. Flat land drivers become lazy in their use of them to every ones annoyance and chagrin, but that's another story for another time, Jer
commando1
Old Man with a Hat
Jer nailed it.
70bigblockdodge
Old Man with a Hat
1. I have never driven a 2 stick. I'm sure there is a system to it, and you do what is comfortable and without thought.
2. Yes you can jump around in gears. As Jer mentioned bobtail or m/t you can skip up, turning from one road to another you can jump back into the middle of the low side to accelerate again, it's all about knowing what gears are right for the speed, again it is not a thought process just "feels right" or knowledge.
3. Jake's are a convenience and brake lining saver. Normally you drive around with the switch off. We all over use it, whether it is on a downgrade, slowing for the 8th red light in a row or just conveying to you that we are displeased with your texting and 10mph below the speed limit your driving. It is not really a emergency braking device. It will really scare the crap out of you, in the winter, when you crest a hill and let out of the fuel to allow the Jake to come on for the downhill and it stalls the engine because the road is slick. There's a pucker moment.
2. Yes you can jump around in gears. As Jer mentioned bobtail or m/t you can skip up, turning from one road to another you can jump back into the middle of the low side to accelerate again, it's all about knowing what gears are right for the speed, again it is not a thought process just "feels right" or knowledge.
3. Jake's are a convenience and brake lining saver. Normally you drive around with the switch off. We all over use it, whether it is on a downgrade, slowing for the 8th red light in a row or just conveying to you that we are displeased with your texting and 10mph below the speed limit your driving. It is not really a emergency braking device. It will really scare the crap out of you, in the winter, when you crest a hill and let out of the fuel to allow the Jake to come on for the downhill and it stalls the engine because the road is slick. There's a pucker moment.
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