Dog Clutch Demo - ZF 9HP 9-Speed Transaxle Operation - Part 1 of 2

[@eddiefrank3319]

I am a service advisor at a Honda dealership and this video was more informative than the official Honda training videos. I have many customers experiencing a "lurch" on up/downshift when the dog clutch engages and this content is a great resource to be able to explain what is going on. Thank you!

[@Mac-mu9cs]

any known issues my wifes pilot just tossed a P170A

[@eddiefrank3319]

@@Mac-mu9cs 9 speed pilots are crap. Trade that fucker in.

[@Mac-mu9cs]

@@eddiefrank3319 yeah sure, not happening not with replacement cost as it is right now

[@Mac-mu9cs]

Wifes 17 pilot Elite had a funny shift. Had dog clutch code. Fluid was changed about 5k miles ago. It looked nice and clean. honda 3.1 fluid. I ended up taking my Autel Elite and running Tech In procedure. The procedure says 500 miles for the trans to learn . I feel like it quick shifts through to 4th gear but all seems well so far

[@danmcmahon1656]

Thanks, John. Very few people are willing to set up the geartrain on a bench to simulate the shifts like you do. Just noticed, at the 10:00 mark, you state that the F dog is applied in 1st thru 7th. You were thinking of the A dog. The F is applied in gears 1st thru 4th. Keep 'em coming.

[@gilbertofilho4099]

Hello! My name is Gilberto. I am from Brazil and I work at Jeep Plant (new Renegade's plant). I work with automotive transmissions. The 9HP ZF is used in the Renegade 2.0 Diesel. I have studied so much about this transmission but I dont had the opportunity of to see all devices (for example: Dog clutch A, F and brakes, clutches B, C, D, E). Thank you very much for this video. I hope more informations about this transmission. I am sorry for my english. Bye!

[@WeberAuto]

+Gilberto Filho Thank you for watching!

[@WeberAuto]

+Gilberto Filho I will have another video soon that will show the additional clutches, power-flow, operation, etc.

[@gilbertofilho4099]

WeberAuto Thank you very much!

[@rafaelrp07]

Gilberto, o que vc me diz do trabalho de software da FIAT com este câmbio ZF no motor Diesel?

[@blackericdenice]

I enjoy learning about the new transmissions out here. I taught myself how to rebuild my 96 Tahoe unit 2.5 years ago and it's still running good. I want to try to rebuild a 5 speed Mercedes or BMW next.

[@WeberAuto]

+blackericdenice Thank you for watching

[@Ademann]

Thank you, Professor John Kelly! I would say that the dog clutches A and F are locked at the start. Then they open and close in the different gears. This makes possible quick switching processes within 450 milliseconds.

[@johneric3886]

I always appreciate your videos and good communication skills. I'm a machinist in a lot of our machines use dog clutches. Hope life is good your way.

[@WeberAuto]

Thanks, you too!

[@dvstiger]

Great job John. We have both come a long way since the GM Base Brake course we both put together.

[@WeberAuto]

Bill! I can't believe that was 21 years ago! I hope you are doing well. Lets catch up some time soon.

[@ollieolson]

John, Thanks for your informative videos, from one instructor to another. I appreciate your public posting of these videos breaking down the function of mechanical components in modern machinery. I enjoyed watching your explanation of the ZF 8HP transmission as well. I'm an instructor of heavy equipment and agricultural equipment machinery to apprentice technicians. Instructional videos such as this help all of us better explain these concepts to our students. If it's okay with you, I'll include your videos as resource references in my instructional materials. Have a great day.

[@WeberAuto]

+Ollie Olson Hi, thank you for the kind words. Yes, go ahead and use them for resource references.

[@sergeantseven4240]

the synchronization is what made so many people complain about these transmissions. The programming from the manufacturer cause a hard shift when dogging. ZF even made a statement that it had nothing to do with their design but was a software issue. The software is supposed to match the engine speed with the shaft speed. That delay in power is noticeable when driving.

[@rampartranger7749]

And 6 years later, Jeep still hasn’t corrected it.

[@billanderson3192]

Dog clutches are mechanical locking devices, and timed by the TCM. Think of driving a vehicle with a manual transmission. But there are NO synchronizers. It would require much skill to match(synchronize) the engine to the wheels. Truly amazing!!

[@WeberAuto]

Good analogy, thanks for your feedback!

[@CaptainSwoop]

Not exactly what I was looking for but your presentation is excellent. I wish more presenters would use a mic.

[@rpinarreta]

Bravo on your explanations, sound and video quality. Thanks for passing on the knowledge. Rob from Canada.

[@thweepz]

If I’m not mistaken I think a dog clutch does release on the 4-5 shift of these ZF 9 speeds. 4-5 and 7-8 have just a slightly slower shift because of it too.

[@1gr8oil]

You did an amazing job of describing how this transmission operates, and the demonstration of the power flow was also very very good. I know know how my 2014 Jeep Cherokee transmission works, and why I have never seen 9th gear when manually shifting it.

[@WeberAuto]

Thank you very much!

[@garrybetts3997]

Hi John, I am about to look at a Fiat 500X small SUV with this ZF 9 speed trans. Your explanation of this Transmission is excellent. Thank you very much. Garry.

[@WeberAuto]

Thank you!

[@Red_Ford]

Did you finally bought 500x? I ask because I thinking about this car with this transmission.

[@joelfigueroa4463]

Fantastic!! I'm a student in Peru and this video help me a lot about the function of dog clutch. Thanks

[@WeberAuto]

Thank you!

[@GammaCruxis]

Wonderful. Always good to see you hale and healthy. Hope to see more of this crazy bit of engineering soon! :)

[@WeberAuto]

+GammaCruxis Thank you!

[@MagaRickn]

Great video. We have a 2015 Cherokee with this transmission and after 6 trips to the dealership, it still has erratic shift problems. Maybe the dealership should hire you to run their transmission shop!! ;)

[@rampartranger7749]

Me too! Everything is just fine once I get to third gear, but from a dead start to enter traffic? Can be terrifying because the computer has to think for a bit, sometimes a full second, before engaging. I am used to it but I don’t let ANYONE else drive my car. They could die. I’ve gotten used to driving semi automatic in low gears, which eliminates the issue, but still, very screwy. Jeep is STILL trying to figure out what’s wrong with the software, 6 years later.

[@goliathprojects7354]

First time someone explained this stuff in a way I can understand.

[@WeberAuto]

Thank you

[@juanvicentemedina9110]

I always enjoy your videos and learn from them. Thanks.

[@WeberAuto]

Thank you

[@DEW409]

Thank you got your reply. A friend has a job at Chrysler Auburn Hills in their testing lab. I recall now that he said he was testing one of their new transmissions (possibly this one) that they were having failures in the field with. He said he could cause it to break almost immediately and could repeat the damage over and over just by aggressively moving the throttle in a certain way while when the car was on the dyno. I saw you demonstrate that spline clutch and it looked like problems to me. I will ask him next time I see him if this was the transmission he was talking about and what the failure was.

[@WeberAuto]

Yes, the slipping of the clutches with some versions of the TCM software caused the clutches to vibrate so much that they caused the snap ring that held in the clutch backing plate to vibrate out; Game over! A software update and a new or repaired transmission addresses the problem. It sounds like product testing was cut short and the public proving grounds (the customers) were used instead.

[@paulj9821]

@@WeberAuto Actually the problems started with ZF not Chrysler. In fact the ZF-9 is considered the black sheep over at ZF Friedrichshafen. There is a reason every manufacturer That jumped on early into the ZF-9 trans all had issues. FCA's big major issue initially was that the snap ring wasn't installed correctly, thus causing serious malfunction which would lead to catastrophic failure. This was rectified in late 2015. The next issue was software programing and while they fixed whatever major issues there were, no amount of software will ever changed the inherent flaws of the ZF-9 design when downshifting.

[@ob_gyn_inc]

Great video as always, keep up the excellent work! We appreciate it very much

[@WeberAuto]

+chickenofsea Thank you!

[@mesics1]

+chickenofsea Best channel in this category )

[@WeberAuto]

+Mesrop Davoyan Thank you!

[@thomasschumacher5318]

Great video! , one thing im wondering is that why do they bother with these dog clutches at all , Why not use other disc type of clutches instead like in every other transmission? Because this is transaxle and needs to be compact, do these dog clutches save lot of space compared to regular multi disc clutch? If yes then why is it not more common, are they less comfortable etc so that they are only used where they must be used to save space for example like in fwd transverse application?

[@adriannewman1322]

Love your videos there very informative. I have this tranny in my 18 jeep renegade with 2.4 engine I know alot of people don't like these trannys. I like this tranny it's got quick shifts. Yes there are things I don't like about it like when you go from park to reverse it has slight delay then when you go from reverse to drive it's got about a 8 to 10 second delay before it engages so I have to tell my wife when she puts it in gear don't give it any gas till it engages. The only other thing I don't like is it does have a aggressive engagement from 4 th to 5th. So my question is 4th to 5th aggressive because of the dog clutch not being timed just right it doesn't do it all the time mostly under moderate throttle

[@neoconversa]

Parabéns pelo canal. Nenhum com esse tipo de demonstração detalhada. Espero que cresça e tenha muitos assinantes.

[@MarioDallaRiva]

Thanks, John. Great to receive notification that you had posted new videos! Hard to believe those tiny dog gear teeth can handle the torque. Couple of questions: 1) what sort of hydraulic pressure is required where you used air pressure for demonstrating the movements? 2) you mention transaxles...is this ZF for FWD vehicles? Thanks again. Always very informative.

[@DoRC]

Are the teeth staggered like that so the gears can mesh in 2 steps? As in the gears drop halfway together turn a little more then slide the rest of the way? It looks like it's designed to stop the gears from just skipping past each other by giving a wider initial space between each tooth. Is this correct??

[@danielcartis9011]

Fascinating. Excellently described as well!

[@dennyTruffles]

Very informative! Nice video man.

[@WeberAuto]

Glad you liked it!

[@tarassu]

Oh. I was searching for this video and you already have it :)

[@WeberAuto]

I am glad you found it! Have a good day

[@rondail5675]

Thank you John for the video and summary of the technology. In your opinion, are these new 8/9/10 speed transmissions just a durable as older 5/6 speed transmissions? For example, say the Honda 6-speed in the Ridgeline compared to the 9-speed in the Pilot? Old 3 speeds, like Ford-C6, GM-400, and Chrysler-TorqueFlite727, where very, very, strong and reliable.

[@WeberAuto]

Thank you! The newer transmissions are typically very reliable, but historically any totally new transmission will have, and has always had, several years of initial problems and updates (including the old 3-speeds). The 9-speed used by Chrysler and Honda has had a rough start, but it seems to be better now. Best wishes!

[@YourTransmissionRepair]

Another great video, John. Thanks!

[@WeberAuto]

+Tanner Transmissions Thank you!

[@antoniovisagie1951]

Awesome video . Just stripped a ZF Transmission , Any idea on the failure of Dog Clutch " A" (spline is worn ) ?

[@WeberAuto]

Thank you! I do not know. I have not heard of that failure

[@sbond1963]

In basic terms when you refer to hydraulic fluid moving the dog clutch does that also mean valve body solenoids pushing ATF down veins under pressure?

[@henrymiecz8566]

Great explanation

[@WeberAuto]

Glad you liked it

[@woodbutcherjc]

I'm looking at buying a Honda Pilot, in your opinion which transmission would you go with the 9 speed or the 6 speed or do you think there is a significant advantage of one over the other? ( longevity or performance)Thanks for any info.

[@WeberAuto]

+woodbutcherjc Hi, either one is a good transmission. The 9 speed will get slightly better fuel economy. Thanks for watching!

[@M63705557]

이 비디오가 제일 유익합니다.

[@WeberAuto]

감사합니다

[@ohcsgroup6770]

Dear Sir, thankyou very much for your "teaching video", so clear. I have a new Jeep Compass 4x4 Latitude plus with a 2.4 engine and the ZF9HP gear transmision. ( think it's 9HP like in your video). It has an strange behaviour. Some times rising at 4000 rpm it seem to be stuck at high RPM, but with just only 60 or 65 miles per hour.( cruise control ON). Revs slow down very slowly till stabilize at 1800-1900 RPM ( more or less 60/65 miles and hour.)Starnge and not safe behaviour. Thanks again.

[@jblyon2]

These 9 speed ZF transmissions are some of the least reliable transmissions that have been sold in decades. On top of that the programming is usually pretty poor too. Some manufacturers do a better job programming the shift logic, but Fiat does by far the worst job. Given that the vehicle is new that could easily be an issue with how Fiat programmed the transmission for your Jeep. The first thing I would do is insist that the dealer check to see if there are any software/firmware updates for the transmission computer. Otherwise the transmission is already starting to slip and fail.

[@ohcsgroup6770]

@@jblyon2 Thank you very much for your answer, dear Sir. I'll try with our FCA representative to upgrade transmision software. Not sure they have that program. I'll see.

[@paulj9821]

@@jblyon2 You are talking nonsense. Infact out of Chrysler, Honda/Acura and Land Rover, FIAT has refined the software best. Honda eventually did a good job on the UK crv. Guess how I know these things cause I work for a living on these cars. Chrysler was the first to debut the ZF-9 on the 2014 Cherokee KL. It took them till 2016 to fix both the snap ring issue and software which in certain cases was damaging the transmission. This also happened to Acura. Anyone with common sense would have known to never buy a brand new vehicle with a unproven, new and vastly complicated transmission. The reason you hear so much of the issues regarding the ZF-9 in conjunction with FIAT is because they were the face for the ZF-9 and they also were the biggest investors for it. They had the most number of vehicles relying on that transmission. This is why they had no choice but to do whatever was possible to get the software up to par. One more VERY important thing to add here. ZF is an amazing transmission company but they are ultimately to blame for all of this. German's are a very prideful people especially when it comes to automobiles. ZF tried to blame AMERICAN driving habits on the software AI not functioning as they intended. They worked hand in hand with FCA for many years to fix this issue. FCA is the largest customer of ZF transmissions with BMW being second.

[@JBM425]

@@paulj9821 Paul, if I buy a used 2019-2020 or a new 2021 Jeep Cherokee, should all the wrinkles be worked out by now? I like how the Cherokee with the towing package can haul up to 4,500 pounds, and has a better infotainment system than the Mazda CX-5 and Toyota RAV4, and has a nicer interior than the RAV4. I really want to like the Cherokee, but the only cars that freak me out more are the Nissan Murano and Pathfinder with the dreaded CVT (and even Nissan is giving up on the CVT in the 2022 Pathfinder and replacing it with the ZF!). I would appreciate your opinion!

[@paulj9821]

@@JBM425 No because the new generation is coming out at the end of 2021 or 1st quarter of 2022.

[@superlativeOFgood]

I like your video. I know of their problems but, in your opinion, is it a mechanically solid design? I want a Jeep Cherokee and am trying to figure out if they will work out the vehicle's problems.

[@WeberAuto]

+superlativeOFgood Hi, I think they have got the problems sorted out now. I would not be worried about getting a new one. Thanks for watching!

[@DEW409]

What keeps those dog (spline) sliding clutches from wearing or grinding upon engagement? Amazing amount of speeds, but a mechanical dog clutch in an automatic? Clutches or bands have always been used for smooth, long lasting service. I have never seen this before. Seems like a point of rapid wear leading to failure. Is this the problem these things are having in the field? Or are the clutches manipulated by the software somehow to synchronize them before applying? Very interesting demonstration, thank you very much. Always wondered how they got so many speeds out of these and how many clutches/bands were needed to accomplish this feat.

[@WeberAuto]

Thank you. The dog clutch engagements are synchronized by computer controlled clutch packs. There is a slight amount of programmed clutch slippage required during some shifts to accomplish this. There is a special transmission fluid required to hold up to the programmed slippage. The fluid contains a limited slip additive to help the clutches and the fluid survive. The problems you may have heard of are related to the programming to control the clutch packs and their slippage rates. I hope that helps.

How are the gear engagements timed to prevent grinding with these dog clutches?

[@WeberAuto]

Speed sensors on the transaxle combined with computer control of the synchronization (using multi-plate clutch discs)

[@stewedapple]

Thanks for an interesting video! Just trying to understand how the piston connects to the "A" drive clutch, is it with a pin that goes through both? Thanks.

[@WeberAuto]

Yes, thank you

[@iambicpentameter7177]

I'm suprised that the small "A" dog clutch spline can take the 280 HP output (and torque) of a Honda V6 engine. Does this transmission look robust enough to handle the power?

[@Spacefish007]

Can you compare a dog clutch with a synchroring? Or does it just open or close and does not have some "rubbing" state like a clutch?

[@WeberAuto]

Hi, a dog clutch must be synchronized by some external method before it can engage. A synchronizer equipped gear does its own synchronizing. I hope that helps.

[@ptg7712]

Is this the transmission that is standard on the 2020 Jeep Cherokee?

[@Rumblebee2144]

awesome work man!

[@WeberAuto]

Thank you!

[@scottcavill4807]

I have a 2015 Acura TLX SH-AWD. The vehicles factory production date is Dec 2014. The trans shifts a tad ruff here and there but otherwise seems ok. I have read some really bad nightmare stories online about these 9speeds. Should I be terrified for my wife and children when they take the car? Or will they most likey be fine. What percentage of TLX owners are actually having these major issues? (ie. I heard of a guy going through 3 trans before he got one that was "ok"). Thanks

[@WeberAuto]

Hi, I would not worry about it. Most of the horror stories I have heard about are from Chrysler vehicles, not Acura. Chrysler used different software to control their versions of the 9-speed; it did not go well. They have updated the software by now and the problem is rare to hear about now. Acura may have a software update for the transmission controller to address the occasional rough shift. If you were going to have a problem with your transaxle, it would have happened by now. Best wishes.

[@KTMcaptain]

Those look far more like spline than actual dog clutches. Motorcycle dog clutches, and typical sequential gearbox ones, have much looser tolerances. But they also round out and eventually can't hold gears, but can be shifted very quickly without the main clutch.

[@aeueeaia]

Is this video sped up? What are your thoughts on the Honda/ Acura zf9 issues? Seems it's specific to acceleration after slowing to 20mph then applying gas

[@puddlejumpernva]

Are you referring to the chirp that occurs when down-shifting from 5th to 3rd? Seems like a common issue for late 2015 build 2016 model MDXs and Pilots. Honda has replaced many under warranty for the impending failure indicated by this reported symptom. If this isn't the result of a leaking ATF warmer and proven to have caused ATF contamination, Honda doesn't seem to want to honor the extended warranty/campaign letter KG9 without having other indications of failure. I just went through this with AHM on my 2016 Acura MDX.

[@keithc5729]

I have one of these. It does not have a dipstick. Should I have the fluid changed ever? at what interval?

[@edvaldosouza1856]

Excelent!!!

[@mrflamewars]

Is the version of this that Jeep calls the 948TE in the newer Cherokee as hateful and horrible and awful as everyone says or does it just operate differently than people expect?

[@WeberAuto]

The 948TE is the version that Chrysler builds here in the USA. The 9HP is the version build by ZF elsewhere. They are basically the same transmission with a few minor differences. Theoretically they operate the same way. The US built version used software provided by Chrysler rather than ZF. It is my understanding that the Chrysler software was terrible in the first model year, but has been revised to be better since then. The terrible software actually caused some premature transmission failures and a lot of unhappy customers.

[@mrflamewars]

Thanks for the explanation. I've read a lot of hateful stuff about this particular box.

[@La-yt1wr]

My mother purchased a 15 Chrysler 200 S with that transmission and it was having issues, she switched it for a 2016 and the issue had been resolved. Honestly I don't understand why the 9 speed is available for N/A 4 Cylinders, the 9 speed takes a long time to up and downshift which can get frustrating unless you had one with paddle shifters. My grandmother has a 2019 Pacifica Limited and I'd say that the 9 Speed works best with the V6 than 4 cylinder, my mother now has a 21 Stelvio Sport Ti with the 8 Speed Auto which I find inferior to the 9 speed.

[@autotronicacc7922]

a question weberauto In this video of this mechanical clutch we see that it works how much is the price of air that Sele manages to make it work? You can send me spesification thanks. good day friend.

[@StuHaightVideo]

Been looking hard at the Ram Promaster City (aka Fiat Doblo), and have been researching the computer issues that came with the history of this Trans. Do you think ZF has it right now? Regardless, getting 9 gears is hella impressive in that size.

[@WeberAuto]

+Stuart Haight Hi, I know there have been some calibration changes. Like a CVT or hybrid-electric vehicle, this transaxle will feel different to the average driver because of the 9 speeds. Whether or not there is actually a problem with the transaxle or a perception issue with the driver expectations, they are working to make it a pleasant experience. Personally, I think they have worked out the issues that first appeared in the early models. Thanks for watching!

[@Jcmichalik2]

+Stuart Haight I work at a Chrysler Dealer as a trans tech and from what I have seen, all the problems with this transmission and any software calibrations were for the majority of 2014 and early 2015 vehicles (14-15 Cherokee and 15 200). As for the ProMaster City, I have yet to see nor hear about any issues with any of them, which could either be due to the low volume of them out there when compared to the amount of Cherokees and 200s and/or that they had the issues ironed out by their release (which I THINK was around the first of the year). So far though, all the later model 2015s have been doing great and I imagine things will continue to improve over time. I personally say to wait for the 2016 ProMasters (or any 9-speed vehicle for that matter) to be safe. All in all though, they are slick little units with shifts that are (now) pretty good. I would love to have a vehicle with one in them personally (been eyeballing a V6 200 myself).

[@StuHaightVideo]

+Jcmichalik2 Great to know, many thanks for the insight. I'm going to get a late 2015 city. I currently drive a 04 sienna like a granny so I shouldn't see myself with too many issues. I will post back here when something pops up. I'm also going to pony up and extend my warranty to 8yrs. Looks like Mopar is pretty good.

[@argishtigroup4490]

I have 2017 Chrysler Pacifica - 9 Speed Automatic . There no information about what type of transmission fluid you have to use and how to check the transmission fluid level . Please advise . Thank you

[@WeberAuto]

Mopar 8 & 9 Speed ATF. You cannot check the fluid level without a special service tool and partially dissembling the inner fender

[@WeberAuto]

It uses Mopar 8 & 9 Speed fluid. You cannot check the fluid level without a special service tool and partially dissembling the inner fender

[@paulj9821]

@@WeberAuto To be more precise the Mopar Fluid is just re-branded ZF Fluid. The oil that goes into the ZF-8 and 9 are the same. These oil were specifically engineered for the transmission. Just like Honda, their transmissions also require special Honda fluid. Edit: this reply was meant for OP, since you already know this information Weber.

[@geojor]

interesting stuff, thank you...

[@jasonsong86]

I have only one and it's pretty major complain on my Passport with this transmission. At certain speed, it does not want to perform certain downshifts usually 5-4 when the gas pedal is pressed all the way which makes the vehicle very slow to accelerate under urgent conditions. I have to manually use the left paddle on the steering wheel to force it downshift one more time in order to get maximum acceleration.

[@ctbale1]

What year passport?

[@jasonsong86]

@@ctbale1 2021

[@gonzalodiaz8731]

Please, could you explain to me why this ZF transmission has problems in the Honda Pilot Touring or Elite?. Is it a problem of the transmission itself or it is due to any other piece around? I am just a consumer interested in owning a Touring but I am scared and have a lot of doubts because I have read a lot of complaints about issues with this transmission in the Honda Pilot. Even I have read about problems in other makes with this transmission, and not only for Honda. I greatly appreciate any response in advance.

[@WeberAuto]

I do not have any information on any Honda issues with this transaxle, but I do know the first model in 2014 Jeeps had problems related to the software for the transaxle controller not controlling the transaxle correctly. This issue resulted in a snap ring coming loose inside the transmission causing other damage. Later model year software and transmissions have been improved greatly. I always recommend avoiding the first model year of a brand new transmission design for this very reason; they always have initial problems that get fixed in the next model year. Honda did not start using this transaxle until 2016, so I would think it would be a better version of the transaxle. Best wishes!

[@Questchaun]

This transmission has problems in a ton of cars. If you are in the market for a new car avoid this transmission at all costs.

[@paulj9821]

@@WeberAuto Again the snap ring issue was a result of incorrectly assembling it in the trans. Also FCA increased the torque for the shift points in the 2014-2015 models. 2016+ all had reduced torque in the shifts, thus increasing the delay's for downshifting. The reason why FCA initially did this was because they were concerned about the ZF-9 less than luckster downshifts. FCA was the first company to unveil the ZF-9 for the industry, packed in their new Cherokee. They had already invested 1 billion dollars in the manufacturing plant for the ZF-9 trans. This transmission was meant to be used in all of their Transverse vehicle lines for the next 8 years. FCA and ZF have one of the closest relationships(second to BMW) in the industry. ZF and FCA worked a compensatory business deal out after the ZF-9 disaster. All of FCA's Newley designed vehicles for 2020-2021+ onwards will be using all of ZF's next gen Hybrid transmissions. Not to mention, we get a very good special price on the ZF-8 from 2016+. Just bare in mind, while ZF engineered one of the best NON DCT 8 speeds in the industry, they did screw up the ZF-9 and they weren't entirely honest about it back in 2011 before our Company went heap in with them. Heads rolled, people in prominent Key positions were fired on the spot due to their incompetence. Volvo almost committed the the ZF-9 until their engineers quickly backed out and instead went with the Aisin 8 speed.

[@DougHanchard]

Dang! 9 speeds, 2 dog clutches and only two small clutch packs? ...

[@adamturowski8948]

and two brakes

[@ohcsgroup6770]

Please, do you have any software /firmware to update my transmission ? Thank you so much for your asistance. I'm not at US !!

[@ianmangham4570]

Aren't human's AWESOME

[@pablopicaro7649]

2021 dec, happy new year, still very interesting. I doubt these 9 ratios have held up well. looks like MANY failure points

[@ohcsgroup6770]

Dear Sir, do you have any hardware or firmware to make an update . Our FCA representatives has NO IDEA about upgrading or remaping a transmission. If having it, can you send me a program or something to do that at transmission ECU. Thanks a lot.

[@johnconor9098]

Спасибо профессор

[@bobdoyle2404]

Hi I have a discovery sport with a 9 speed auto box 2017 heavy jerk when going from 2nd to 3 nd when cold LR tell me this is normal, love your thoughts cheers bob

[@MistaRoyanT]

My 2017 Acura MDX does the same when cold

[@La-yt1wr]

My grandmother's 19 Pacifica Limited does that as well, but continue with the maintenance and trans updates.

[@hanspaulavisser855]

Love the video, thank you. I'm trying to find what ATF is used in these boxes is like searching for a needle in a haystack. Would you be able to advise what is best and how much it takes please?

[@Sailor999999999999]

I like this :)

[@WeberAuto]

+Yenlung Lo Thank you!

[@pravinkumar-qk8td]

what is the profile of such tooth called ?

[@donberg01]

Does a dog clutch perform the same function as a synchro?

[@WeberAuto]

+Don G. No, the Dog clutch cannot work unless the gears are already synchronized. The transmission controller synchronizes the dog clutch gear teeth by using the other multi-disc clutches in the transaxle. Good question!

[@donberg01]

OK TX for that info, It's just that I have been told by truckers that they can shift a manual WITHOUT using a clutch! I find this hard to believe! Is this magic?

[@WeberAuto]

Don G. Hi, yes, truckers or anyone else who gets very familiar with the operation of their transmission can shift through most gears without using the clutch; however, it does accelerate the wear of the synchronizers. They try to synchronize the engine RPM (transmission input shaft) and transmission output shaft speed themselves. If you can synchronize those two speeds, then you can move the shift sleeve without releasing the clutch. Thanks for your feedback, you have great questions!

[@donberg01]

Is the reason the drivers can synchronize the output shaft w/the input shaft is due to the very narrow RPM band a slow revving Diesel has? Whereas a high revving auto has a wide RPM band making that trick difficult?

[@WeberAuto]

Don G. That certainly makes it easier, but it can be done with wider ratio transmissions too.

[@bobdoyle2404]

Forgot the rpm increases followed by the gear change.

[@apwang2436]

Why do gear? What's pro from it?

[@WeberAuto]

Smaller package inside the transmission. Space was limited.

[@apwang2436]

+WeberAuto Does dog clutch means this AT gear box got Manual Transmission DNA?

[@WeberAuto]

ap wang Yes, you could say that

[@hddm3]

cool

[@WeberAuto]

+hddm3 Thank you!

[@ShahnewazYT]

Is this video sped up?

[@WeberAuto]

Yes, some people said I talk too slowly, so I slightly sped it up. It was a mistake. Thanks for watching

[@ShahnewazYT]

@@WeberAuto No worries! I'm just familiar with how you talk so I caught the change in pace. Do note, viewers can change the playback speed themselves.

[@WeberAuto]

@@ShahnewazYT Thanks

[@billthestinker]

too many problems with this 9 speed

[@goddesseddog]

Wouldn't the use of dog clutches drastically increase the amount of debris in the fluid and significantly reduce the life of this transmission?

[@WeberAuto]

Good question. Theoretically no, the job of the transmission controller is to use internal clutch packs as synchronizers. Once the speeds of both sides of the dog clutch are synchronized, the engagement will be quick and easy (no grinding). I hope that helps.

[@jasonsong86]

On Hondas that use this transition (Pilot and Passport), they recommend changing transmission fluid every 45000 miles.

[@iqtedaralikhan3192]

hello sir

[@robertdemaio5663]

why does this transaxel drop into low gears at high speeds putting the drover in danger.

[@WeberAuto]

I do not know. I would check with your dealership to make sure the latest transmission control software is installed and that there are no error codes set. Best wishes.

[@donberg01]

An interesting concept I thought you would like to view! turbo-friction clutch: kzbin.info/www/bejne/hXStk3Sqdtp9oZY

[@itsJohnnyDill]

Two dog clutches......... two reasons to never, EVER buy any vehicle with the ZF 9HP DildoMatic.

[@WeberAuto]

Thanks for your feedback!

[@dhy5342]

You, and ZF, can call this a dog clutch, but it's nothing more than a synchronizer, coupling two gears together. Dog gears are constant mesh gears where one can rotate in one direction but not the other.

[@WeberAuto]

Thanks for your feedback. What you are describing sounds like a part called a "Sprag Clutch" or "Roller Clutch" or "Ratcheting Clutch". I have never heard of a dog clutch that acted like a one-way clutch, but I could be mistaken. Thanks again.

[@pvb9964]

compared to a robust dodge 727 or ford C6....seems very "tinker toyish"