I am retired after 50 years auto mechanic, many schools with Ford, GM, Toyota, and John Deer. This is the best instructor ever.

Isn't it wonderful that this esoteric knowledge is available for everyone? This is the promise of the internet.

Absolutely brilliant teaching of a VERY difficult subject. Well done! I don’t know what they pay this gentleman, but he most certainly deserves a raise. I’ll bet you the students all love this guy.

This guy is fantastic. He is a great teacher.

I've been a truck mechanic for over thirty years working on manual transmissions, Automatic transmissions have always been somewhat of a mystery to me. This explanation has taken all the mystery away. I am amazed at the technology and engineering that goes into developing mechanical systems. Guess that's why it has always been so interesting to me. The "stator" reminds me of a turbocharger, it increases power (torque) with the byproduct of what is already there being used. Genius!!

Excellent explanation. I wish more instructors were as good as this guy.

Professor Kelly, you are one AWESOME and patient teacher and you should be very proud of your work! I've been turning wrenches my entire life but decided that it was time for a change in my mid 30s to get out of the wrenching and management position I had been in for many years and take things to a new level. I was already by then burned out and bored as hell. So I ventured off the beaten path and I've now been a engineer for all sorts of lab equipment used in R&D of new pharmaceutical across a multitude of big down to startup firms and it's much more rewarding as well as a easier way to earn a decent salary and not busting your knuckles everyday in some cases to barely survive and put food on the table. Now I'm older but still turning wrenches on my own stuff being out of the loop for so long in the industry I try to stay on top of current changes in the industry across the board. But out of any other videos I've ever come across so far, professor......yours are simply the best and there's no BSing around and not only the fact that you explain in great depth of the history and theories of how things came to be so, this captivates my attention 100% and I picked up on so many dumb little things I didn't know about or how it came to be which is just as fascinating to me as well! I've probably rebuilt a dozen car and truck automatic transmissions mainly in my drag cars but plenty of other run of the mills domestic GM transmissions over the years. I was missing bits and pieces of how things came to be or how why things were like they were! Like you explained that the secondary hydraulic oil pump on the early Oldsmobile Hydromatics were basically only there for push starting the automobiles of the day which was common place back then. I never knew these little facts because it was never taught by my instructors or was in the books I've read due to relevance and modern designs. I think your an amazing teacher and I love to listen to you talk about these things and it feels like I'm literally back in school while doing so, it's not some greasy guy smoking a cigarette in the garage of his house with transmissions parts and fluid spilled all over the floor trying to explain things, your work is done beyond a professional level of higher learning. The fact you are battling M.D. and are still getting around and giving everything you have to educate the youth puts you upon another level in itself as well as I think most everyone would also have to agree with!!! I WISH they made some good progress in this medicine for M.D. or even better than meds, genetics being it's passed on by the mom at birth. I have a friend who is in a chair now too in his early 40s. We grew up together and he knew that this was his life and basically when it would totally debilitate him, having uncles in his family and seeing how it effected them made him feel pretty bad about his outcome in life. I can fully understand why anyone would feel like that too, it's a definite tough hand you've been dealt! But you've got so much to be proud of! Your accomplishments and services to our youth is something that you can hang your hat on Sir and I honor and thank you for your service to mankind as being a great teacher and seemingly a great mentor to your students as well. That's a pretty rare thing to be able to say you possess both sides of the coin lol but thank you for helping me learn something new as well. Take care and I wish you all the best in your travels, hopefully 🙏 soon they'll have a cure for this M.D.!?!? Sincerely a distant student from NYS Jim C.

Nice explanation, for a long time I never realized the clutch existed based on what I learned when I was younger, I’m not a mechanic so it wasn’t important to know, I only realized there was more to a converter than the pump and turbine after reading out trouble codes. Wish I would have had this resource years ago. Thanks.

I’m impressed! I’m self taught on my 700r4/4l60, but a Hydraulics and electrical Engineer for 30+ years and have attended many training courses and this guy has a gift..

For reference, vacuum cleaners use a multi-stator system to generate suction. Great video - great series. You're an amazing lecturer and you make me wish I were an automotive student.

This type of tutorial is very important for students as understanding how systems work will give opportunities for future proper diagnostic faults. Is one thing to remove part and replace is other to diagnose and pinpoint fault. A good technicians is the one is good at both. Great tutorial.

I am old school (i'm 82) and I started out with a 1947 chevy fleetline. I broke nearly every thing on it (I was 17) but I did all of my own repairs. It was a great experience. I learned it from my dad, and passed it along to my son. I never really had a conceptual picture of automatic transmissions and torque converters. Your course is fantastic. It makes me want to buy an old automatic transmission and tear it down and rebuild it! Thank you so much! PS, my dad had a 1948 dodge with fluid drive. I kind of understood that, and it was clearly your primitive baseline case.

One of the most complicated mechanics in the vehicle has been explained with so much ease in this video. Did not have any proper knowledge on Torque Converter or fuild coupling but now i know quite a bit of those things. Will watch the video few more times to understand the whole operation together.

I have tried to explain the TC operation to the average person and have had pretty good response in understanding... but this has to be the BEST way I have seen it explained in a way the average person can really understand the basics! 😎 Good JOB Prof. ☺️

Wow... I cannot thank you enough. As a student in a third world country without much access to the teaching aids you use in your lectures, you contribute immensely to our understanding. THANK YOU

Good to watch after the previous lecture where the Allison got assembled there. By the time things got around to the stator it was getting super interesting. I had no idea how that torque multiplication effect worked. Cool stuff!

I could watch this guy teach all day!!! Hope those kids understand how lucky they are!!

The whole thing seems easy now You're a great teacher sir 👏👍🙏

Thanks for the explanation on stall speed and using the analogy of passing another vehicle. Wish my instructor 30 years ago had used it. Stall speed after 40 years of working on cars just clicked at the moment you used that analogy-ThanksJJ

ive been a transmission mechanic for thirty years and this has been one of the best explainations of how torque converters work that I have seen. very well done

That's the best understanding of what a torque converter does and how it works. Fantastic thanks

I mechanic for 40 years. And u are the first instructor that has made this so clear. The bolts holding the ring gear to the tc was never mentioned in school.

Professor John is a fantastic teacher and his students are so fortunate he is at Weber.

A truly inspirational well educated born instructor. I had maybe 4, in 12 yrs of school and 4 yrs in university. Thank you sir

John - you're truly a classroom hero...perhaps an international treasure, too. Cheers to great instructors who are no BS. It's very hard to come by these kinds of pragmatic teachers.

A picture paints a thousand words. So nice to see you simplify it right at the start using two desk fans. I had a basic understanding before this video but now I know so much more. I have an overheat light on my Landcruiser auto transmission, now I fully understand why it is there on a 4x4. Top video for all young mechanics and all youtube guys.

An excellent video. You had your students engaged too. I enjoyed the interaction.For a slight update, the torque convertor clutch on a 8HP450E does engage in first gear regularly. When the electronic throttle control is commanded to go to idle the torque convertor lockup clutch is commanded to disengage at the same time. Another thing ZF did with this design is to rethink the damper springs, there are more of them and they appear to be longer. If you covered that in another video I apologize.

This man is a Genius! Wish we would have such a great professor at my own university, it's so much fun and much easier to memorize when you have great teachers like him :)

i've seen this cat lecture on many engine components. i love his style of instruction. old school and thorough...

We should all have teachers like him. Thank you professor

Nothing beats a physical class, but I must say I feel right at home though I've been learning exclusively online. As you asked the class questions I was able to answer correctly on the spot most of the time. I follow you and Engineering Explained for the more technical and conceptual aspects and ETGC and ChrisFix for demonstration and procedure. Not to mention a ton of other random videos I'll watch throughout the day. I'm also reading a great book by Tim Gilles on engine diagnostics, repair, and rebuilding and I hope to have my ASE here in a couple years. All just from studying in my spare time. Amazing what you can learn just online for free. Thanks for the great content

This video is so outrageously excellent at explaining what's going on...the clutch, the stator, the fluid coupling thing....the pump I will have my boss (a programmer) finally understanding his car.... Because of you sir, there is hope in far corners......Lend not a microsecond to despair!

I've sat down for countless videos trying to understand torque converters and automatic transmissions to no avail. Two of your videos and im finally grasping it. Thank you for your patient explanations. Brilliant teacher.

00.05....... why is the giant fan on the table? 00.07....remembering when I was a youngster looking thru an early GM hydramatic repair manual....2 fans facing each other the air from one causing the other to rotate. Complicated stuff in 1954. When you are 8 years old... Thanks for the great videos you produce! And thanks, for the memories...

Love this guy amazing at getting you the small scale idea of how things work. It makes everything so much less overwhelming when you explain each parts purpose the way he does

after 6 years it is still best explanation of stall speed..Thank you...

I learned more in this 40 minutes than I did in a year of schooling. KZfaq: Saving money and time. Thanks for this.

Thank you prof. Your classes are great. I'm not engineering student. Just a person keen and opening my horizon on these subjects. Very interesting. Followed your classes from your walking days to wheel chair. Didn't know what happened to you. Prayers and blessings for your family and you. Take care sir. Again gratitude for these classes.

this is so fascinating. I love to know how everything works...

Again,best explanation of stall speed I have ever heard and I've heard a lot of them. Your students are lucky to have you.

A sincere thank you from Australia for having this vid on KZfaq. I'm nearing the end of a 545-RFE rebuild, my first auto rebuild. His expert teaching put the last pieces of the puzzle in place in my head, the torque converter with all its components is now understood, and not a mystery. Plus, his added comments on heat effect, fluid flow after the converter, stall speeds, etc...really stepped it up another level again. 11 out of 10, for me, possibly the best tuturial I've ever seen in here. Brilliant👍

Bob Krietz was best automotive tech instructor ever.

hi john just want to take the time and say thank you for all your videos and thank you for answering all my questions I have learned so much in the last to months from you and hopefully can I apply that to my own projects you are by far the best instructor I've came acrossed! thank you so much!

Best explanation i have come across. NOW i understand!

i watched like 2 other videos with fancy CGI animations and stuff and all didn't make sense, I watched this video, I know everything I needed to know. Amazing teaching!

I truly appreciate you and the videos you make. These videos not only help me but countless others to understand transmissions and related components. You're a very special person and I thank you for your time and knowledge. I wish I could have attended your classes. Hopefully you continue to educate your students and the world for years to come. Again, thank you. Also, the things that you laugh at cracks me up. Bless you and your family John. :)

This guy is really good at explaining the complex to lay folks

Well, thanx for the first six minutes. Don't have to work on these things, I don't do anywhere near that level of work on my cars, but I have seen torque converters, I've asked my mechanic about what goes on, I knew about fluid transfer since I was two, but no one (no video) had simply and at a decent speed disassembled, displayed, shown in context, and reassembled one for an intro tutorial like this one here. So in the first six minutes you did that and it tied all the other shit together. I may have known how the converters worked but I didn't KNOW how they worked. Good job.

Not sure who the lecture is but his explanation is excellent, being from the UK where manual transition has been the norm but automatics are now becoming more popular and I wanted to get a good understanding of them and this lecturer delivered it spades...great job sir.

I think that Mr John Kelly is the best teacher in explaining things properly

Very good instructor. This is also the ideal duration for a lecture. Any longer and the information is less likely to be retained.

Your channel just ruined my night. I spent all night watching your videos. By far some of the best explanations around. Looking into your online class now.

It shows his knowledge in how he can state so much in simple terms.

Excellent videos! It's incredible to watch a master share his craft.

He explains very clear. He also has a very strong back. The torque converter stuff are so heavy but he can lift them up, move them around by sitting on his chair.

Thanks for the explanation. Excellent presentation. Earlier on planetary gear was also excellent. I could first time understand the planetary gearbox working correctly.

Outstanding! Thank you for taking the time to present this stuff in such a great and understandable way!!

Thank you for your excellent explanation of the torque-Converter. It's good to know what is happening while driving our automobiles.

Great stuff. In fact, I wonder why I am now coming across this youtube channel. Perhaps the youtube algorithm needs an update. I also love the brilliant delivery by the teacher.

Sir, you are the man! After all these years I finally have it down. Knew about the TCC but that was about it... thanks!

THE best explanation of how a Torque Converter works I have ever seen.

Really amazing teacher. I wish I had something similar here in Argentina. Thank you for sharing your knowledge.

I down loaded this lecture to understand transmission gear operation in addition to understand pure English language . Grateful thanks

This is a great teacher. Very personable. Not like some robot machine just there killing time. It's like a friend teaching you.

Great job explaining how a torque converter work, thank you ✌

I don't understand why someone dislikes this extraordinary demonstration!

I thought they did! I will measure it when I pull the cover got to get the axle spline count and ring gear size for the axles and axle bearings! thanks a lot John you have helped me with so much information on axles but I am still itching to try a full differential rebuild to see if I can do it you gave me all the knowledge now have to put it into action!

Thank you WeberAuto! I finally understand how a Torque Converter actually works!

He really is the best teacher on transmissions that I have ever seen really explained it to where I could understand it or to the best of my understanding it

Great lecture. Very clear explanations and demos. Thank you for sharing!

Great work and amazing videos, puts in practice all the theoretical part. that sometimes is easy to understand but not so easy to imagine. Great work !!

This is a very good explanation of the torq converter. Great work!

This is absolutely the best video I’ve seen on torque converter operation… Bravo…. Extremely well done!

So that is why its called a "slush box." Thanks for the video.

Informative, awesome and confident and literally takes you to the world of transmission.

Torque converters with the stator in them was around in the early 1960's. British built BW-35 auto transmissions had them. Torque converters with clutches first appeared in some Euro cars in the 1970's. I have worked on these. Early German built cars from the 1960's with auto transmission had a 4 speed box, & this also had TWO internal pumps. The primary pump is engine driven, & the secondary pump is driven by the output shaft. With such transmissions, something very odd takes place. Once the car is travelling above a certain speed, usually around 30mph, the rear pump takes over all internal operations of the transmission, & the engine driven pump circulates the oil through the cooling system. Some British built cars with BW-35 trans of the air cooled type had two pumps, along with some BW transmissions found in some early Toyota Crown cars. A very interesting thing I would like to add is that some Mercedes-Benz cars built between 1959-1965 with manual transmission had an "automatic clutch". These cars had a clutch like a normal car with manual gearbox, but no clutch pedal!! These had a fluid coupling between engine & clutch. The clutch mechanism was operated by a vacuum solenoid with vacuum from the engine, operated by a switch in the gear shift system in the steering column. The release rate was controlled by a valve governed by a control box on the rear axle. The reason early auto transmissions had two pumps is to enable the car to be tow started if the battery was flat, or roll started if you were parked on a hill with your car pointing down hill. My car has two pumps in the transmission.

That is really best ever explanation of torque converter operation ever. Thanks.

Wonderful description of torque converter operation. Thank you.

I am taking A2 next week I feel so lucky I am watching your videos thanks for sharing a good explanatory.

It was a very useful and educational video. Thank you a lot! It helped me to understand how a torque converter works.

thanks alot...WeberAuto is really helping me to go on with my studies as I am a Diesel Mechanic student,whereby the r no demonstration at my school....so ur videos very much important...thank u

Realy like your video, it adds a lot. understanding torque converter and lock-up mode. appreciate, thanks alot.

Yet another awesome lecture. Thanks a lot for the upload!

Excellent walk through John this has been very simple be very logical to follow and understand.

3 sections in a simple torque converter, impeller, turbine and stator. It is an involved lecture to explain it all.

Thank you, Finally I Understand how Torque Converter works. Appropriate it..

I came across this video lord knows how and loved it. Great teacher! Cheers from Brazil!

It made sense to me , that was brilliant I just learned about torque converters , much appreciated ,thanks.

Beautiful explanations and practical tips for driving to avoid eccesive wear and abuse of the Trany. 5 Stars!

clear explanation on how the torque converter works. great job, sir!

I wish all teachers were like this guy !

i am ase master certified' rebuilt some transmissions at dealerships and this video still amazes me in its depth of understanding. you are a great teacher .the questions asked break the train of thought. i don't know about teaching but i wish that questions would only be done after the lecture because you answer them if they would just keep quiet long enough.

Gr8 stuff. I love turbine technology .. amazing. Thankyou for your clear explanations. some good practical everyday info and advice in there too.

Muchas gracias por sus videos,a nivel de mecanica y vehiculos electricos. Un saludo desde España

Awesome explanation!

Great class. Thanks for sharing.

That question at 10.20. LOL. Designed to keep things cool? Should of thrown 'em out. It's designed to transfer power, not keep the torque converter cool. That's what the transmission oil cooler is for. I am NO mechanic and I know that much. Great videos BTW, I've learnt so much today. Thanks,

Thank you for the explanation!

I like your way of teaching. Great job . Makes it a lot easier to understand .

Thank you again Sir. You're Good!!!