You are one of the few people who understand the 15 speed. Most guys have not been trained properly on them and drive them as a 10 speed. A lot of clutches got burnt, and they quit making them. The 15 speed was a great transmission only if guys know how to drive it. BTW, when backing with these trucks, you should always use deep reduction. Mid range is too fast for most guys and they will burn the clutch. So, I would like to try to simplify sequential shifting for the 15 speed. Here goes: Start off in deep reduction range. Put the stick in 1st, then 2nd, then 3rd. Move the range selector to mid range (they call it low!) and move the stick back to 2nd, then 3rd, then 4th, then 5th. Then move the range selector to high, and move the stick back to 1st, then 2nd, and on up to 5th. And it's just that easy. Hope this helps. If you want to learn how to double clutch, partial clutch, and float, go to my video "3 ways to shift a 13 speed". Drive safe, and happy motoring!
According to the RT & RTX 15 Speed instructions in my Ford L9000, you're wrong. It's deep reduction 1st to 5th. Then 4th and 5th in low. Then 6 to 10 in high. And if you're not Mr. Fuller himself let's not argue about this...
Ok, always wondered, I've run 9 , 10, 13, and 18 speeds but was always told 15 is a odd transmission, for the most part you would run it like a 10 speed. Thank you for that very instructional video !!!
15 over you can usually run it like a straight 10. High gear in each range is against the dash on my eaton fuller 15 over. The lower 5 gears are deep reduction which I very rarely ever use.
@2:31 THIS is the key piece of info that is never made clear in other videos. When people talk about deep reduction yielding "5 gears in the basement", it makes it sound as if 5+DR is lower than standard 1 (which if true, would give 15 different speeds). Super helpful to understand that there really are only 12 different speeds-- just different combinations of achieving some that are the same.
1) great explanation Nate ! 2) i have watched your 2 driving videos many times...i really admire your relaxed shifting style and overall finesse with which you're operating your rigs!
Thanks for posting this. I have a 4900ex with a 15 sp. Know how to shift it fairly well but the stepping back a gear to get out of deep reduction is a nifty trick.
I was taught Deep 5 to Low 4 was like a 1/2 Gear change as opposed to Deep 5 to Low 5 you would stall as i found out the hard way I never made that mistake again😂.
I agree. I've developed a massive love affair with the 18-speed. As far as I'm considered, every truck should have an 18. Lol. Out of all the options in today's market, the 18 is absolutely the most versatile and useful.
Really made it simple what you discuss actually was loosely stated on the pattern of the 15spd single axle ford L series dump I sat in. It said if your off road you can use all the gears in deep reduction but if your gonna progress shift it. Then only use till 3L then once you are there put the blue button forward and grab first gear and shift it then shift like a 10spd it actually said if you progressive shift on road higher than 3L damage could occur to the transmission
If you have an engine with a narrow power band and want to work off and on road a 15 spd is the BEST trans you’ll find. It has the super low hole like an 8LL but has far closer ratios for keeping speed on the road where an 8LL Puts the gears too far apart. A 13 or 18 speed doesn’t have a low enough first gear to do much good in the dirt. Plus in theory there’s less to go wrong in a 15, you move the shifter through all 3 ranges instead of using a button every other shift like on an 18.
Taylor Alldredge the 18 speed is the best all around trans you’ll find but they are expensive to spec and dumber drivers may not do too well with them. Now the RTO/RTX 15 and RTO/RTX 8ll both have the same ratio top gear so you won’t gain any top speed. Where the 15 helps out is it basically has 2 extra “in between” gears that the 8 doesn’t. To shift a RTO 15 progressively you’d go deep reduction 1-2-3 then out of deep reduction and into 2nd then up to 10th. As far as longevity I’ve found the 8LL’s to be the best. I have an RTO (high gear toward the dash) 8ll In my dump truck and it’s the perfect trans for a dump truck, but our lowboy tractor has an RTO 15 speed in it and it’s a better trans in that application (VERY heavy). It’s all about what you wanna do. As far as being friendly for hired drivers an Allison auto is always a good choice, way less chance of a cowboy tearing out a rear end or clutch with an auto.
Im a 12 year Truck Driver and i just learned how to use a 15!! I didn’t know about the deep reduction gear. I always assumed that the 15 i drove was a faulty transmission. I think that 15 speed trans are a thing of the past!!!
I had a 4964 ex star car with an n 14 plus and 15 speed. The salesman at WS of demoine Iowa didnt know how to shift it and I was used to a a 10 speed but the deep reduction didnt make sense. I asked every driver who said they knew a 15 speed and all I always got was I never use deep reduction or just take it out and grind it into a low range gear. I always used it to 4th DR then preselect (blue pill) and shift to 3rd low range which is an upshift, and away I would go. Dont select DR when your rolling pretty good in low range or youll about go through the windshield because it will drop 2 gears NOW.
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I am going to be Spec’ing some Dump Trucks. I want Transmissions with a Overdrive and have been considering a 10, 13, 15, & even 18 Spd’s. The 15 Spd caught My Attention. I want that Overdrive on the way back home. I want something different than a 8LL. Seems 15 Spd’s were more common in Mechanical & 2000 & Older Trucks.
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John Hoffman it shows you commented but for some reason it is not showing up. I was curious to hear your opinion.
@ Sorry, the 15 spd doesnt seem to be used any more. I would think it is a good tranny for a dump truck because it allows you to crawl around gravel pits loaded at slow speeds (to a walk if you want) and climb out without working the engine. You have to be careful because when you select deep reduction from the low range it immediately drops in and squats the truck (you drop 2 gears instantly). 1.5 million miles and never had an issue with it.
Then you put a mf in a rto with the turn around pattern and it’ll make him look like a baby 😂 and you right I flip out of third in low and go back to second high then shit and get, if your foot racing you can change thru all five on low side and flip in high go to fourth then fifth and then get in high range. Good explanation video thought man
I see you can drive this like a regular 10 but why do that when you can start in deep reduction 3 then up shift to 3 😎 while empty, if loaded i recommend starting at deep reduction 3rd then regular 2nd then deep reduction 5th, then back to 4th and then 5th this actually looks really fun i cant wait to drive mine
Just bought a T800 with 15 speed RTO. Man it got me confused.. not to mention this is the first time I drive a big rig. Thanks for making this video. It would be cool to see on a graph where the gear ratios actually are.
Dr Frantz Thanks for the feedback! Like I mentioned in the video, I'm not sure of the exact ratios, but practically speaking, just imagine that the deep reduction gear you're in is two ratios below the gear position you're in. DR 3rd, 4th and 5th are simply duplicates of your standard 1st, 2nd and 3rd gears.
So when you want to get out of ‘deep reduction’ you just simply pull the blue button back and your back at normal low gears and can start climbing up your gears?
You didn’t mention that you can also split the low side of you want. You can go from L1 to 1-2-3-4-5, or L1-L2-L3-3-4-5 etc. This transmission is more commonly known as an 8LL.
Great explanation. Only drove a 15 a few times and that's just how I recall it...had to pull into an empty parking lot to figure it out as I was covering for another driver and never drove a 15 speed before. I assumed it was just like a 13 with two additional gears and kept trying to split the high side....felt like an idiot. Do you have a how-to video for a super 10? I loved driving a super 10 but a lot of people hated it.
I WAS IN SOMONE BACK YARD SND GROUND WAS KIND OF SOFT AND WAS SINKING IN THE GUY LOADED ME UP WITH DIRT AND I WENT TO DRIVE AWAY AND I HAD THE BLACK SELECTOR DOWN ON FIRST BUT I HAD THE SPLITTER BACK AND I WENT TO PULL OFF AND GAVE IT A LITTLE GAS AND THE DRIVE SHAFT DROPPED TO THE GROUND DID THIS HAPPEN BECAUSE I DIDNT HAVE THE SPLITTER IN DEEP REDUCTION OR WAS IT INEVITABLE WHEN I WOULD RELEAE THE clutch when I had it on low/1st it would just go a little then die and it would sink a little more each time
Unless people had a chance to pull 140K Lbs or heavier, people don't understand the need of momentum. You can have engine power to pull and because of lack of momentum you can't shift or you are on a grade inclination and because the torck force from the engine is too quickly engaged by the heavy load it does nothing but shake the cab violently without going anywhere. That's when Lo-lo and Lo-hi gears are handy in an 18 speed and deep reduction in 15 comes so handy to make that power- torck transition. This power-torck transition is the reason why authomatic transmitions are useless in pulling heavy loads. By the time the sensors sence something wrong the whole thing goes bust.
n8bolton...can i convert a 10 speed transmission to 15 speed. Its a eaton fuller transmission 10 speed. Do they sell a kit conversion? I dont know the model of my transmission but i will look it up.thanks sir
I plan to get some more videos of some behind-the-wheel action, yes. Once I have a good external mic for my camera, I'll try to capture some good stuff.
I'm confused about something, since I've never driven a 15 before, let alone an American truck. I would assume by the name "Deep Reduction" that it is the LOWER of the two gears in that position. i.e., "Five High/Five Low". But then you say flip the splitter "forward" for DR. Wouldn't that be the higher gear then? I'm lost. Is DR the higher or lower gear?
It’s a little bit counter-intuitive but yes, pushing the splitter forward while in low range is how you reach the deep reduction ratios. You’re right, though, that typically that’s not the way most other transmissions work.
If you can drive 1, you can drive em all. It’s all the same shit, you move a stick into different holes and split gears lol nothing different there except just a matter of how many gears can you split and that’s literally it
So really, a 15-speed is just a 12-speed and they could've extended the shift pattern one more gear and just kept it high/low? I'm not a trucker, but I completely fail to see the need for all these stupid switches and modes and splits when you can just have a 5, 6, or 7-speed H-pattern with a high and low range of all roughly evenly spaced and NON-redundant gears. Or even better, a 4 or 5-speed H pattern with a 3-position low/med/high range of NON-redundant gears for a total of 12 and 15 speeds, respectively, based on what kinds of loads or conditions a truck is working with. 18 speeds just seem like unnecessary overkill with no benefit.
When you’re running heavy (100,000 lbs+) all these gears are necessary. Much easier to get moving and keep gaining momentum on hills or on soft terrain. You have to drive these transmissions to appreciate their value.
@@n8bolton My main point is that the patterns can be simpler and any redundancy (like how 15s are actually 12s since deep reduction 3rd is the same ratio as low first) can be done away with. Tell me, how many actual UNIQUE gears without overlap are there in an 18-speed? If it's 14 or 15 unique non-overlapped gears then everything I said stands. Make the shift patterns 5, 6, or 7 positions with only a high/low switch, or 4, 5, and _maybe_ 6 positions with a low/med/high switch if 18s are truly 18 and not fakes like 15s are. No overlaps or redundant gears.
@@Drunken_Hamster 18-speeds have 18 non-overlapping gears. The 15 is the only air-shift transmission with this anomaly. Older twin stick transmissions also exhibited this.
There isn't an "11-15". There's a deep reduction 1-5. That's what I'm trying to help people understand. A 15-speed is a glorified 10-speed with 5 ultra-low gears that overlap the normal low range gears. Most drivers would never shift a 15 any different than they would a 10.
@@n8bolton I am sorry, I didn't understand "deep reduction". Do you mean that the splitters will help to keep the vehicle in control at 6.5, 7.5, 8.5, 9.5 and 10.5. Thus total transmission would be 10+5 gear transmission? This is what my idea of a 15 transmission vehicle
It gives five gears below the normal 1-5, while in low range. The first two gears in deep reduction are slower than 1st gear. Deep reduction 3-5 are practically equal to your normal 1-3 ratios. So, practically speaking, a 15-speed only offers two more ratios over a 10-speed.
@@n8bolton So this is my question:- In low range we have 1 to 5. In high range we have 6 to 10 as it appears in the paper - very well show. How do we hit the gear as you refer to it " below 1 to 5"?
When you're in low range, pushing the blue switch on the shifter forward gets you into the low-low gears, which you can shift in exactly the same pattern as 1-5. Simply pulling the switch back brings you back into your normal low range.
Lol you talk way toooooooooo muuuuuuuuuuuuch!!! Like so bad!! Gonna keep it simple? Lol no you didn’t but I’ve got years on this and I’ll make it simple for the people who really need to learn. 5+5=10speed……split 6-10 and now you essentially have an additional 5 gears which 5x3=15. Difference between a 18, 15 and a 13 speed is 13 you split a few, 15 you split a few gears but 18 you can split all the gears. Red splitter 13 speed, blue splitter 15 speed and grey splitter switch 18 speed. There ya go all summed up into 1 paragraph lol your welcome
You are one of the few people who understand the 15 speed. Most guys have not been trained properly on them and drive them as a 10 speed. A lot of clutches got burnt, and they quit making them. The 15 speed was a great transmission only if guys know how to drive it. BTW, when backing with these trucks, you should always use deep reduction. Mid range is too fast for most guys and they will burn the clutch. So, I would like to try to simplify sequential shifting for the 15 speed. Here goes: Start off in deep reduction range. Put the stick in 1st, then 2nd, then 3rd. Move the range selector to mid range (they call it low!) and move the stick back to 2nd, then 3rd, then 4th, then 5th. Then move the range selector to high, and move the stick back to 1st, then 2nd, and on up to 5th. And it's just that easy. Hope this helps. If you want to learn how to double clutch, partial clutch, and float, go to my video "3 ways to shift a 13 speed". Drive safe, and happy motoring!
According to the RT & RTX 15 Speed instructions in my Ford L9000, you're wrong. It's deep reduction 1st to 5th. Then 4th and 5th in low. Then 6 to 10 in high.
And if you're not Mr. Fuller himself let's not argue about this...
Ok, always wondered, I've run 9 , 10, 13, and 18 speeds but was always told 15 is a odd transmission, for the most part you would run it like a 10 speed. Thank you for that very instructional video !!!
15 over you can usually run it like a straight 10. High gear in each range is against the dash on my eaton fuller 15 over. The lower 5 gears are deep reduction which I very rarely ever use.
I drove a Ford Loiusville in the early 80s, 350 Cummins 15RR. Deep reduction was frozen, it never worked from not being used over a period of 5 years.
I've driven 9, 10, 13 and 18spds. Never understood the 15spds. Confused the hell out of me, lol! This is informative and very helpful. Thanks! 👍
@2:31 THIS is the key piece of info that is never made clear in other videos. When people talk about deep reduction yielding "5 gears in the basement", it makes it sound as if 5+DR is lower than standard 1 (which if true, would give 15 different speeds). Super helpful to understand that there really are only 12 different speeds-- just different combinations of achieving some that are the same.
1) great explanation Nate ! 2) i have watched your 2 driving videos many times...i really admire your relaxed shifting style and overall finesse with which you're operating your rigs!
I very much appreciate the compliments! Glad you've enjoyed the content!
Thanks for posting this. I have a 4900ex with a 15 sp. Know how to shift it fairly well but the stepping back a gear to get out of deep reduction is a nifty trick.
I was taught Deep 5 to Low 4 was like a 1/2 Gear change as opposed to Deep 5 to Low 5 you would stall as i found out the hard way I never made that mistake again😂.
Simpler solution: get an 18 speed 😁
EdwardRAZRhands it’s for dump trucks
It's more for dump trucks, and farm trucks, I believe. But I will agree 18 is the do all transmission
I agree. I've developed a massive love affair with the 18-speed. As far as I'm considered, every truck should have an 18. Lol. Out of all the options in today's market, the 18 is absolutely the most versatile and useful.
Amen.
Really made it simple what you discuss actually was loosely stated on the pattern of the 15spd single axle ford L series dump I sat in. It said if your off road you can use all the gears in deep reduction but if your gonna progress shift it. Then only use till 3L then once you are there put the blue button forward and grab first gear and shift it then shift like a 10spd it actually said if you progressive shift on road higher than 3L damage could occur to the transmission
Thanks this has helped me to under stand it
Holy cow! Did I drive a 15 speed for years thinking it was just a 10 with a deep reduction? I guess tomato-tamatah
Very helpful, thank you!
If you have an engine with a narrow power band and want to work off and on road a 15 spd is the BEST trans you’ll find. It has the super low hole like an 8LL but has far closer ratios for keeping speed on the road where an 8LL Puts the gears too far apart. A 13 or 18 speed doesn’t have a low enough first gear to do much good in the dirt. Plus in theory there’s less to go wrong in a 15, you move the shifter through all 3 ranges instead of using a button every other shift like on an 18.
Taylor Alldredge the 18 speed is the best all around trans you’ll find but they are expensive to spec and dumber drivers may not do too well with them. Now the RTO/RTX 15 and RTO/RTX 8ll both have the same ratio top gear so you won’t gain any top speed. Where the 15 helps out is it basically has 2 extra “in between” gears that the 8 doesn’t. To shift a RTO 15 progressively you’d go deep reduction 1-2-3 then out of deep reduction and into 2nd then up to 10th. As far as longevity I’ve found the 8LL’s to be the best. I have an RTO (high gear toward the dash) 8ll In my dump truck and it’s the perfect trans for a dump truck, but our lowboy tractor has an RTO 15 speed in it and it’s a better trans in that application (VERY heavy). It’s all about what you wanna do. As far as being friendly for hired drivers an Allison auto is always a good choice, way less chance of a cowboy tearing out a rear end or clutch with an auto.
15 and 18 speeds are great for lowboy hauling. I used to use them and they were very effective
I thank you for that knowledge sir❤
Im a 12 year Truck Driver and i just learned how to use a 15!! I didn’t know about the deep reduction gear. I always assumed that the 15 i drove was a faulty transmission. I think that 15 speed trans are a thing of the past!!!
Yeah. Helped a lot. Sounds like you should come out of deep reduced 3 into standard 2 and take it from there.
Yup. That's what I would do; deep 3rd to 2nd or deep 2nd to 1st.
I had a 4964 ex star car with an n 14 plus and 15 speed. The salesman at WS of demoine Iowa didnt know how to shift it and I was used to a a 10 speed but the deep reduction didnt make sense. I asked every driver who said they knew a 15 speed and all I always got was I never use deep reduction or just take it out and grind it into a low range gear. I always used it to 4th DR then preselect (blue pill) and shift to 3rd low range which is an upshift, and away I would go. Dont select DR when your rolling pretty good in low range or youll about go through the windshield because it will drop 2 gears NOW.
I am going to be Spec’ing some Dump Trucks. I want Transmissions with a Overdrive and have been considering a 10, 13, 15, & even 18 Spd’s. The 15 Spd caught My Attention. I want that Overdrive on the way back home. I want something different than a 8LL. Seems 15 Spd’s were more common in Mechanical & 2000 & Older Trucks.
John Hoffman it shows you commented but for some reason it is not showing up. I was curious to hear your opinion.
@ Sorry, the 15 spd doesnt seem to be used any more. I would think it is a good tranny for a dump truck because it allows you to crawl around gravel pits loaded at slow speeds (to a walk if you want) and climb out without working the engine. You have to be careful because when you select deep reduction from the low range it immediately drops in and squats the truck (you drop 2 gears instantly). 1.5 million miles and never had an issue with it.
This video makes great sense. Thank you.
Well Explained just bought a truck with it. Thanks
Good video.
Then you put a mf in a rto with the turn around pattern and it’ll make him look like a baby 😂 and you right I flip out of third in low and go back to second high then shit and get, if your foot racing you can change thru all five on low side and flip in high go to fourth then fifth and then get in high range. Good explanation video thought man
You plenty understood.
I see you can drive this like a regular 10 but why do that when you can start in deep reduction 3 then up shift to 3 😎 while empty, if loaded i recommend starting at deep reduction 3rd then regular 2nd then deep reduction 5th, then back to 4th and then 5th this actually looks really fun i cant wait to drive mine
15 speed in theory 12 in the practice, 10 speed plus low/low and low, or 10 plus low1 and low2, 15 speed with 3 speed repeated equal 12 speed.
Thanks, very informative. I understand it now..
Just bought a T800 with 15 speed RTO. Man it got me confused.. not to mention this is the first time I drive a big rig. Thanks for making this video. It would be cool to see on a graph where the gear ratios actually are.
Dr Frantz Thanks for the feedback! Like I mentioned in the video, I'm not sure of the exact ratios, but practically speaking, just imagine that the deep reduction gear you're in is two ratios below the gear position you're in. DR 3rd, 4th and 5th are simply duplicates of your standard 1st, 2nd and 3rd gears.
So when you want to get out of ‘deep reduction’ you just simply pull the blue button back and your back at normal low gears and can start climbing up your gears?
That's right.
n8bolton i figured
Great commentary.
Thank you sir I found this video really helpful
Nice tutorial, simply stated.
Well explained, thanks for sharing.
I love this guy ...
You didn’t mention that you can also split the low side of you want. You can go from L1 to 1-2-3-4-5, or L1-L2-L3-3-4-5 etc. This transmission is more commonly known as an 8LL.
Great explanation. Only drove a 15 a few times and that's just how I recall it...had to pull into an empty parking lot to figure it out as I was covering for another driver and never drove a 15 speed before. I assumed it was just like a 13 with two additional gears and kept trying to split the high side....felt like an idiot. Do you have a how-to video for a super 10? I loved driving a super 10 but a lot of people hated it.
Great video man thanks
The deep reduction are basically ghost gears
So basically you drive it like a regular 10 speed unless you're stuck, heavy haul, starring in Garth Brooks' Papa Loved Mama music video, etc?
Lol correct
@@n8bolton Good. Now I can better hide the fact that I'm a goober when I go test drive one.
I WAS IN SOMONE BACK YARD SND GROUND WAS KIND OF SOFT AND WAS SINKING IN THE GUY LOADED ME UP WITH DIRT AND I WENT TO DRIVE AWAY AND I HAD THE BLACK SELECTOR DOWN ON FIRST BUT I HAD THE SPLITTER BACK AND I WENT TO PULL OFF AND GAVE IT A LITTLE GAS AND THE DRIVE SHAFT DROPPED TO THE GROUND DID THIS HAPPEN BECAUSE I DIDNT HAVE THE SPLITTER IN DEEP REDUCTION OR WAS IT INEVITABLE WHEN I WOULD RELEAE THE clutch when I had it on low/1st it would just go a little then die and it would sink a little more each time
Having it in deep reduction may have helped. Maybe not, though. If you were already sunk, it still may not have gotten you out.
Thanks for the video man
So a Norman 80lb loads on pavement i would shift it like a 10?
Lovely, couldn't be simpler
Unless people had a chance to pull 140K Lbs or heavier, people don't understand the need of momentum.
You can have engine power to pull and because of lack of momentum you can't shift or you are on a grade inclination and because the torck force from the engine is too quickly engaged by the heavy load it does nothing but shake the cab violently without going anywhere.
That's when Lo-lo and Lo-hi gears are handy in an 18 speed and deep reduction in 15 comes so handy to make that power- torck transition.
This power-torck transition is the reason why authomatic transmitions are useless in pulling heavy loads. By the time the sensors sence something wrong the whole thing goes bust.
n8bolton...can i convert a 10 speed transmission to 15 speed. Its a eaton fuller transmission 10 speed. Do they sell a kit conversion? I dont know the model of my transmission but i will look it up.thanks sir
Not that I'm aware of. I've heard of 9-speed to 13-speed conversions. Haven't heard of a 10 to 15, though.
you made this sound very simple! great video! will there be any new driving videos?
I plan to get some more videos of some behind-the-wheel action, yes. Once I have a good external mic for my camera, I'll try to capture some good stuff.
n8bolton damn u made that so much easy for me ..other people on utube just complicate it
Câmbio Fuller ?
I just learn how to shift a 15spd
I am so confused,
I’ve only ever driven 13 and 18 speed
I'm confused about something, since I've never driven a 15 before, let alone an American truck. I would assume by the name "Deep Reduction" that it is the LOWER of the two gears in that position. i.e., "Five High/Five Low". But then you say flip the splitter "forward" for DR. Wouldn't that be the higher gear then? I'm lost. Is DR the higher or lower gear?
It’s a little bit counter-intuitive but yes, pushing the splitter forward while in low range is how you reach the deep reduction ratios. You’re right, though, that typically that’s not the way most other transmissions work.
So it's basically a 10-speed with five speeds deep reduction
Thank you
What’s the horse shoe?
A shift pattern where the gears furthest to the right are in opposite positions as a standard H-pattern.
Only 15 I’ve run is rto with different pattern.
If you can drive 1, you can drive em all. It’s all the same shit, you move a stick into different holes and split gears lol nothing different there except just a matter of how many gears can you split and that’s literally it
Yea I’ll just switch it to 18 here pretty soon
The 18-speed made the 15-speed mostly irrelevant, as far as I’m concerned. 18 is a jack-of-all-trades.
15s are ok, but I’ll stick with an 18 speed for my needs
Agree. An 18 will do everything a 15 will do and more.
@@n8bolton I know guys that love the 15, but I’ve never been able to figure out why. Maybe it’s because they don’t know how to split gears.
So really, a 15-speed is just a 12-speed and they could've extended the shift pattern one more gear and just kept it high/low? I'm not a trucker, but I completely fail to see the need for all these stupid switches and modes and splits when you can just have a 5, 6, or 7-speed H-pattern with a high and low range of all roughly evenly spaced and NON-redundant gears. Or even better, a 4 or 5-speed H pattern with a 3-position low/med/high range of NON-redundant gears for a total of 12 and 15 speeds, respectively, based on what kinds of loads or conditions a truck is working with. 18 speeds just seem like unnecessary overkill with no benefit.
When you’re running heavy (100,000 lbs+) all these gears are necessary. Much easier to get moving and keep gaining momentum on hills or on soft terrain. You have to drive these transmissions to appreciate their value.
@@n8bolton My main point is that the patterns can be simpler and any redundancy (like how 15s are actually 12s since deep reduction 3rd is the same ratio as low first) can be done away with. Tell me, how many actual UNIQUE gears without overlap are there in an 18-speed? If it's 14 or 15 unique non-overlapped gears then everything I said stands.
Make the shift patterns 5, 6, or 7 positions with only a high/low switch, or 4, 5, and _maybe_ 6 positions with a low/med/high switch if 18s are truly 18 and not fakes like 15s are. No overlaps or redundant gears.
@@Drunken_Hamster 18-speeds have 18 non-overlapping gears. The 15 is the only air-shift transmission with this anomaly. Older twin stick transmissions also exhibited this.
@@n8bolton So they jumped straight from 10 to 13 to 18 and didn't consider a true 15 in the middle. Got it. Thanks for the clarification.
That's a 15 speed direct
Yep my 15 over 10 and 15th gear is against dash where 4th and 9th is on this pic
@@davidroberts2404 Nothing like skinning them knuckles on the dash!!!😃
@@davidroberts2404 I loved the Overdrive 15s,I found the Hook from 3 to 4 then up to 5 easier than the 15 Direct pattern.
Are all 15 speeds deep reduction?
kylebob2525 Yes, sir.
Can’t these be shifted like a normal 10 spd?
Yes. In fact, that's how you would most often drive one. The deep gears are rarely necessary.
n8bolton thanks for the reply
Sup
Howdy
You explain 15 speed and show only 10 on paper. If you added 11to15 on the paper, it would have been useful
There isn't an "11-15". There's a deep reduction 1-5. That's what I'm trying to help people understand. A 15-speed is a glorified 10-speed with 5 ultra-low gears that overlap the normal low range gears. Most drivers would never shift a 15 any different than they would a 10.
@@n8bolton I am sorry, I didn't understand "deep reduction". Do you mean that the splitters will help to keep the vehicle in control at 6.5, 7.5, 8.5, 9.5 and 10.5. Thus total transmission would be 10+5 gear transmission? This is what my idea of a 15 transmission vehicle
It gives five gears below the normal 1-5, while in low range. The first two gears in deep reduction are slower than 1st gear. Deep reduction 3-5 are practically equal to your normal 1-3 ratios. So, practically speaking, a 15-speed only offers two more ratios over a 10-speed.
@@n8bolton So this is my question:- In low range we have 1 to 5. In high range we have 6 to 10 as it appears in the paper - very well show. How do we hit the gear as you refer to it " below 1 to 5"?
When you're in low range, pushing the blue switch on the shifter forward gets you into the low-low gears, which you can shift in exactly the same pattern as 1-5. Simply pulling the switch back brings you back into your normal low range.
So pretty much a 10 speed
In most cases, yes.
Males sense.. trust me... I can drive a 15speed, 18speed, 13 speed, 7speed , 10 speed. I sure can..
Lol you talk way toooooooooo muuuuuuuuuuuuch!!! Like so bad!! Gonna keep it simple? Lol no you didn’t but I’ve got years on this and I’ll make it simple for the people who really need to learn. 5+5=10speed……split 6-10 and now you essentially have an additional 5 gears which 5x3=15. Difference between a 18, 15 and a 13 speed is 13 you split a few, 15 you split a few gears but 18 you can split all the gears. Red splitter 13 speed, blue splitter 15 speed and grey splitter switch 18 speed. There ya go all summed up into 1 paragraph lol your welcome
15 speed has no spitter button it has deep reduction which can only be used on low side you can only progressively shift 12 gears