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Post by pete379 on May 19, 2004 12:41:34 GMT -5
I consider this the veteran driver trans, but i like to know alittle more about this trans. What's the shift pattern. Is it pretty simple? This is what is found on roadranger: Now i'm i suppose to switch the high/low for every gear, or just use the high side for every gear? Is the low just for if i have a heavy heavy load? What is the best choice for reverse high/ or low? Thanx for the help.
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Post by truckertom on May 19, 2004 19:42:27 GMT -5
That transmission is like a Spicer they were trying to put together to compete with Roadranger. The truth is most of the old transmissions are obsolete today. Once upon a time, the pulling range was between 1750 and 2100, the powerband was much narrower than trucks today. This tranny would have you in the hospital having rotator cuff surgery if you shifted/split every gear avalable. So you learn to skip a few.
There was an old 4x4 airshift that was a 16 speed nitemare. They were always breaking down. You had a four position thumb switch and each gear position had a four way split to it. It was fragile, and it didn't last long.
So the transmission you show has a high low split in evey gear position. Lot's of work. Drive it through Detroit in rush hour in town shifting every gear and you will be ready for a 5 speed Maxidyne transmission.
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Post by SilverBullet on May 22, 2004 6:30:47 GMT -5
truckertom summed it up pretty well in his explanation. But to answer your last question, reverse is always done best in low gear.
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Post by truckertom on May 22, 2004 19:33:21 GMT -5
"reverse is always done best in low gear."
I had a student try it in high range on the backing yard recently...No sir, He didn't like it!
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Post by rocknsand on May 22, 2004 21:43:48 GMT -5
"reverse is always done best in low gear."
Unless you are driving an ol Mack "2 sticker". Then you put the high/low stick in reverse and you can shift 3 times with the regular stick. Of course this in an old concrete mixer where you do a lot of backing and sometimes a long ways.
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Post by Rachelle on May 23, 2004 23:49:02 GMT -5
Some guys just love the 18's, but I'm not a big fan... My preference is a 13. No, no, no, don't split all the gears, too much work and that's coming from someone who enjoys shifting. The only case for shifting thru the high/lows instead of a full gear might be if you are climbing a grade. Otherwise, I tend to shift an 18 pretty much like a 9.
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Post by truckertom on May 26, 2004 9:50:56 GMT -5
We had an old 5x4x2 Autocar and the two was just a deep reduction. When every gear was in 1 except reverse, the truck would nearly come to a stop between moving.
Many of these two stick fans would be throwing rocks at it if they ever had to drive through LA during rush hour.
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Post by Fozzy on Jun 6, 2004 3:41:48 GMT -5
We had an old 5x4x2 Autocar and the two was just a deep reduction. When every gear was in 1 except reverse, the truck would nearly come to a stop between moving. Many of these two stick fans would be throwing rocks at it if they ever had to drive through LA during rush hour. LOL~! ;D I had to drive our "yard goat" to the San Francisco Shipping Yards one day. It was a VERY old 66 White Freightliner no sleeper cabover!!! This things cab was shorter than any truck I'd ever seen! Looked like a phone booth! Anyway..It had a 5X4 in it. I was so frustrated by the time I got TO San Francisco that I darn near took a bus home! I'd get going fine....then something would happen and as soon as I try and downshift.... ....Come to almost a full stop (which in rush hour traffic on I-80 was normal) to get back into a gear... By the time I got it back to Fairfield I was a nervous sweaty wreak ready to give up truckin for good!!! Fozzy
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Post by truckertom on Jun 15, 2004 19:29:38 GMT -5
"By the time I got it back to Fairfield I was a nervous sweaty wreak ready to give up truckin for good!!!"
LOL!! I tell my students all the time that you could leave a brand new Pete with a 5x4 double stick delight in a truckstop and you would never have to worry about it getting stolen.....nobody knows how to drive them anymore, and those who do are in the nursing homes......
OMG! I'm busted!
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dhagood
425 Detroit
eschews obfuscation
Posts: 57
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Post by dhagood on Jul 2, 2004 1:53:18 GMT -5
i used to be pretty good with a 4x4 many years ago. i like 10 and 13 speeds a lot better ;D
18 speeds can be nice i guess if u have some burning need to accelerate from low speed up a steep grade or something, otherwise, i'd take rachelle's advice and shift it like a 9 speed...
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Post by truckertom on Jul 4, 2004 9:32:31 GMT -5
"18 speeds can be nice i guess if u have some burning need to accelerate from low speed up a steep grade or something, otherwise, i'd take rachelle's advice and shift it like a 9 speed..."
Really! I would rather listen to the CD player that make shifting a hobbie!
Those old 4x4s cause "Brownie Elbow" that is where you must get your steering wheel romoved from you left elbow....takes a surgery.....in a hospital.....for old truckers.
Could you imagine a retirement home dedicated to truckers? They would be having fights in the rec (wreak) room every day on the theory of the perfect float!
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Post by Pcuthbert on Sept 7, 2004 11:28:57 GMT -5
Hi guys;
I am stuck with the 18 speed. That is the only tranny that my company will buy. Why? Because of the loads we haul. (140,000 lbs)
I have been using it for the past number of years, and have come to the conclusion that it can be used much like a 13.
My usual shift pattern is 1L-2L-3L-4L-5L-6L-7L-7H-8L-8H. When climbing hills, I will seldom split the gears (running in H) as I downshift, unless I am almost holding in the gear. Then I will split to L and continue up the hill.
My power is a Mack 460Hp with torque limited at 2200 lb/ft.
Hope this helps;
Pat
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