Why do manual and automatic transmissions use such wildly different gearing mechanisms?

I have been watching a bunch of videos on different transmission designs recently, and I am stuck on a seemingly straightforward question. Manual transmissions and automatic transmissions are designed very differently, with the latter using planetary gears and torque converter. My question is: why did automatics switch to this completely different gearing mechanism, vs. just automating the shifts in a manual transmission?

I am aware that clutchless and automated manual transmissions exist, but I am not aware of why the conventional automatic transmission design was adopted instead of them. Is this purely historical? (If so, what happened?) If not, what engineering advantages does a conventional automatic offer over an automated manual transmission? (The wikipedia page on automatic and automated manual transmissions did not give me a clear answer.)

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Another Jeep I've got to drive, it was a super bumpy ride though, and a 3speed transmission, I prefer automatic for wheelin. 1974 Jeep CJ-5 Renegade. (This things a death trap)
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Eight-speed automatic transmission from a Lexus LS 460 Sport
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What’s with shift paddles in a car with automatic transmissions?

I’ve been driving automatic my whole life and am very new to learning about manual cars. I saw a car that was said to have an automatic transmission (BMW M4 competition). However, it also has shift paddles. What exactly do these shift paddles do? I assume that it’s for shifting gears but if so, why is this car not considered a manual?

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Eight-speed automatic transmission from a Lexus LS 460 Sport
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AUDI A7 3.0TDI service items questions for Haldex-clutch oil and automatic transmission box oil

https://preview.redd.it/rp18ih5y4gn61.jpg?width=4608&format=pjpg&auto=webp&s=59c714266cdcb810f9ad890999aaff4952f9d2e9

I have an AUDI A7 3.0TDI biTurbo, diesel type, with normal 8 speed automatic transmission box, 4WD, now it is around 90000km, 6 years old. I bought it when it had 70000km.

Recently I had a service at a AUDI service center, including changing engine oil, engine oil filter and the aircondition filter.

I checked the user service book and found that the Haldex-clutch oil needs to be replaced every 3 years for all AUDI cars. But in the sevice book there is no service record of the Haldex-clutch oil since the car is manufactured... The former owner did not do it either within the first 70000km/4 years.

My understanding is that a 4WD car must have the four-wheel-drive system which needs the oil and oil needs to be replaced.

In addition, the service chief said this car has the normal 8 speed automatic transmission box which is a long-life type so no need to change the gear box oil---To be honest, I can't believe that an automatic transmission box does not need oil change...

Do you believe that?

Thanks!

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Are automatic transmissions faster then a manual?

Im sure that the new automatics are better then the manuals like the 2018 mustang one but what about like 2005 or 2010 or even 2015 are the autos better in those?

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So, this is interesting. 1995 Ford Ranger XLT is starting at 70 miles per hour like its 0. (If I'm going 10 mph it says I'm going 80, etc.) It's been like this since I got it. Any help is appreciated. (Automatic transmission, 4 liter V6)
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I have a automatic transmission leak on my 2007 Jeep 4 door wrangler reddit.com/gallery/m7wigf
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Your choice of automatic transmission? And why?
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Exactly what is the purpose of neutral in an automatic car transmission?

I understand that it's necessary for manual transmission, since you need to go to neutral every time before switching gears.

In an automatic transmission, it switches for you, so you stay in drive the entire time. Of course, when you want to go in reverse, you stop the car, and switch to that.

Given that, exactly why would you ever need neutral?

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If a manual transmission option for patrol vehicles were offered by Ford, Chrysler and GM, how many of you would choose it over automatic?
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Successfully finished a automatic to manual transmission conversion on my R52S last night!
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There was no name on the back so... I need your help people. It looks kinda old but I was surprised to see it had an automatic transmission
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I just got my first car, a 2011 Ford Fiesta SE with an automatic transmission and I absolutely love it. Any tips I should keep in mind?
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Has there ever been an automatic transmission with a user-controlled clutch?

I had the thought recently of a sequential automatic transmission, but where pulling the steering-wheel paddles electrically disconnects a clutch until you let go.

So, for example, to downshift, you might pull the paddle and hold it while rev-matching with the throttle, then release the paddle to engage the clutch (and the lower gear). It would end up feeling a lot like driving a motorcycle, as I'm imagining it.

Has this kind of transmission ever been built? I'm curious to find out. I'm not having much luck on google.

Thanks!

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Nothing wrong with liking automatic transmission! /r/cars/comments/kkz8n9/t…
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Honda Accord V6 - Worth it as automatic transmission?

I have no experience driving a manual car, and while I wouldn't mind learning to drive one, I'm not quite sure it would be the best move considering I'm looking to buy a car in the 15k$ range and that I really don't want to regret my decision.

I've heard a lot of good things about the Accord V6, but most of my friends suggest me to go manual considering the main pros of that car are the transmission and power. If I choose automatic, would that car still be worth it for the price tag? Would it be "fun" to drive regardless?

The reason why I'm looking for the Accord V6 : It's classy and not too flashy, fast, midsized, I love coupes, it's great for road trips, it's extremely reliable and I just love the sound of V6s. My new job will be in the mining industry, meaning I will work remotely 2 weeks per month where I won't have to daily commute. I also live a fairly rural region, so even though I'm planning to visit cities and do road trips, most of the time, I won't be stuck in traffic.

So yeah, what are you thoughts on the automatic V6?

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Are mutli-speed automatic transmissions possible?

I'm seeing all these videos on youtube where people are making functioning automatic transmissions and Im wondering why, at least through the googling I did, I can't find any multispeed autos for the 1/10th scale. Is there something holding manufacturers back? Or am I just dumb and needed to look harder?

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When you look online for a Manual Transmission supercar and pictures show it is an Automatic...
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So a quick stupid question, why can’t a S62 have an automatic swap transmission so it’s an automatic M5 but the M62 can have a manual swap? Sorry If it’s too stupid too ask lol reddit.com/gallery/ll0xxg
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Brake fluid leak (Followup) 2001 Toyota Corolla, Automatic Transmission, 187K miles
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it's 2:30am and I just finished my first transmission rebuild. it's a ford c6 from my 1988 f150 351. I've rebuilt a few engines and know how manuals work but until today automatics were pretty musterious. it sat for a decade and the forward apply piston was stuck. wash, paint, install.
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Reliability of 2013-4 Outback 3.6R (automatic transmission) vs. 2016 Outback 3.6R (CVT)?

I would love to hear folks' thoughts/experiences related to the reliability of the the 2013-14 Outback 3.6R Limited, with the automatic transmission, vs. a 2016 3.6R Limited, which has a CVT.

Some background:

  • I am looking to purchase a used Outback for hiking/camping/road trips/mountain excursions, as a daily driver, and to use as a part-time micro-camper.
  • I found that I prefer the power/acceleration of the 3.6R engine compared to the 2.5i - especially for highway merging, driving in the mountains/at higher elevation, etc.
  • I am waiting to purchase a vehicle with Eyesight.
  • I hope to have a vehicle last me for the next 7-10 years with as few repairs as possible other than routine maintenance.
  • I've never purchased a vehicle with more than 30k miles so have some hesitation around buying a 'higher' mileage used vehicle - and also want to keep my purchase price as reasonably low as I can!

Would love advice - would you purchase/recommend:

  • 2013 or 2014 Outback 3.6R Limited - automatic transmission, likely to have higher mileage (80-110k), is a few years older, much harder to find with Eyesight as it was an add-on, likely to be a little less expensive ($17-18k out the door)
  • 2016 Outback 3.6R Limited - has a CVT (and seems to have an extended powertrain warranty for 10 years / 100k miles due to the CVT warranty extension program), slightly newer, easier to find with lower mileage (50-70k), higher price point ($22k out the door if lucky)

Is the CVT / automatic transmission a distinction to dwell on or less of a consideration than some of these other factors like mileage? Any/all thoughts & advice welcome!

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Should I change my transmission fluid(automatic)

My 2011 BMW 328i has been a bit rough as of recent, my car has 104k miles on it, and I bought it 6k miles ago. Would it be worthwhile for me to change my transmission fluid? I heard if I do that I should only drain half of the fluid and put the another half in with new stuff.

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In Winter weather, do you feel safer driving a manual transmission or an automatic?

Yes, you should always pull over when conditions deteriorate. However, weather apps and reports aren't perfect.

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Supposed to be -4 outside today. These are the temps I wish I had an Automatic. Manual Transmissions hate subzero temps its like churning butter
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Clunking sound only when accelerating. Has been going on for few months. Changed transmission cooler line, no change. Pontiac G6, 2005, automatic. v.redd.it/w5ftc8ci00m61
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How do you use 4x4 and the +/- symbol gears on your automatic transmission?

Before I get a "read your truck manual" I'm asking about generally how do and when do you use these functions.

I just got a 4x4 SUV (2010 Lexus GX460) from just using a normal FWD car, so my knowledge on anything with an automatic transmission and shifting is just Park/Neutral/Reverse/Drive.

What specifically is 4L and 4H used for, can you just switch those on with the car moving? There's a picture of a stick figure car with an x in the middle which im assuming is a lock differential, do you have to be parked before you engage any of those? Also there's an ability on the shifter to go from Drive to some S +/-, does that make your car faster or responsive or something like a higher gear in a manual transmission? Does that mean you can just shift to S +/- while I'm driving on the highway?

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Eight-speed automatic transmission from a Lexus LS 460 Sport
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Those of you who decided to buy a car with an automatic transmission, were there any differences in how the car handles, did you have to change how you drive?
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i have a 2006 mustang automatic, can I put a manual transmission and make it manual?

im not really sure but I'm assuming this theory would work?

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Eight-speed automatic transmission from a Lexus LS 460 Sport
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Automatic Transmission Tune to hold gears longer?

Hey guys, just wanted to see if anyone did an automatic transmission tune here. I know automatics aren’t very popular here but maybe someone could tell me if a transmission tune makes more sense than an engine tune.

I have some bolt one but it’s NA. I was hoping to tune my automatic to hold gears for longer, closer to like 6k on every gear or whatever the optimal shift time is for each gear for most performance. Correct me if I’m wrong but 350z automatic transmission from factory comes with most fuel economy shifts so my understanding was that a tune can make the transmission hold gears for longer to get more performance.

Thoughts?

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Is Changing the automatic transmission fluid actually necessary

I have a 2009 forester and it's starting to slow up a little at 97k miles, I find when changing gears they jump around a little, and sometimes if push the car on a hill it can be pretty sluggish. Was talking to mechanic and just by looking at my past service records he wants to do a whole bunch of things such as change the automatic transmission fluid, transfer case fluid, rear diff fluid, brake fluid flush, pcv valve, fuel system flush. From my limited knowledge, a lot of these things do not seem necessary except maybe the pcv valve change. I have particular concern over the automatic transmission fluid since I have read some things saying that it can actually damage the transmission. Was curious on thoughts about this since there seems to be a lot of opinions, mostly that an older car gets used to the dirty fluid and a change can damage if not break the transmission.

He also wanted to do the timing belt which needs to be done but I was hoping to wait for another 5k or so.

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[OC] Automatic transmission mechanical/hydraulic computer (valve body) of a BMW 528iA 1996. My brother just had this serviced and the mechanics took some pics while working on it. Credit goes to ZF for making the pics! Lovely stuff reddit.com/gallery/j957o8
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Is this 1984 Toyota Corolla SR5 worth $5k? It has an automatic transmission with 110,000 miles. Has a clean title. reddit.com/gallery/l52xju
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