Hi all, What is the most realiable automatic gearbox ? For car after year 2010 , also cvt or automatic gearbox is more reliable please tell me some brands and models or cars ... thanks.

 

If we include hybrid, any Toyota HSD transmission although some don't' consider it a transmission. Extremely reliable no chains to break, no torque converter, clutch plates. Even after 200,000 miles the ATF still looks good although I recommend changing about every 100K.

 

So this is toyota CVt transmission , how about regular automatic gearbox which have normal ordinary toyota or lexus non hybrid petrol fuel cars ?
Are they extremely reliable or not so much?

 

Technically, on paper at least, the one-speed transmission units on pure-electric vehicles should be the most reliable. They are quite simple, with few moving parts.

 

I don't think a single reduction gear counts as a tranny. It's probably a ZF or Asin 8 speed. Unbreakable.

 

Toyota's 8-speed has been out for quite a while. Never heard about any problems with them. I like mine overall, but shifts are a bit rough when in stop and go traffic while in manual mode.

 

Not sure the point of the thread. Name a transmission that is considered UNreliable these days?

 

Well, to some extent, anything with more than 6 speeds. In general, the greater the complexity, the greater the chances for malfunction. And even simple trannies like CVTs can be unreliable if they use sub-par materials in their construction. CVTs have traditionally suffered from early drive-belt failures, the unit's weakest point....though the latest-generation of CVTs are more resistant to that than in the past.

 

Point of the tread is my wife wants automatic , and he driven so far manual diesel in Europe so we need super reliable automatic gearbox for her something from year 2010 or up.

 

The evidence shows exactly the opposite. 8+ speed transmissions have been available for over 20 years now, and in that time window, almost none of the notably failure-prone transmissions have had more than 6 gears. Here are a few notoriously unreliable transmissions from that period that stick out for me:

Ford 6-speed powershift DCT from the Focus
Ford 6-speed auto from the Fusion/Milan
Honda 5-speed auto from the Odyssey
BMW 6-speed SMG from the M3/M5
Ferrari 6-speed "F1" Gearbox
Aston Martin 6-speed SCT
Chrysler 6-speed auto from the Caravan/Town & Country
GM 6-speed auto from the Buick Enclave/Chevy Traverse/Cadillac SRX
Various Nissan CVTs

As you note, CVTs are among the simplest transmission types, yet are among the least reliable, and certainly most sensitive to regular maintenance.

During this same period, the most complained-about high-gear-count automatic transmission was the ZF 9-speed in the Honda Pilot and Acura MDX. But that wasn't a reliability concern--these transmissions didn't fail, Honda just did a crap job of programming the shift logic so they were extremely annoying to drive. This exact same transmission worked perfectly fine (and reliably) in many Chrysler products. The Ford/GM 10-speed has proven to be extremely reliable, even when pushed hard in 800+ horsepower built Mustangs. And of course, the most ubiquitous automatic in the world is the ZF 8-speed, which has been exceedingly reliable.

 

Agree on the ZF 8 speed, geko29 - it's ubiquitous, because it's excellent.

 

So is the normal toyota / lexus non cvt gearbox fitted in persol engines reliable or not
Also does honda have any reliable transmission fitted into car.

 

Not according to Consumer Reports. They list substantially more problems with newer 8, 9, and 10-speeds than they did with older 4 and 6-speeds. They track that each year with questionnaires from owners who report both major and minor transmission problems. Now, granted, those (problems) could be anything from a rough-shift to a complete tranny rebuild or replacement.

 

A lot of us don't put a ton of stock in those surveys, for reasons we've hashed out ad nauseum. But most relevant to this discussion, the Pilot/MDX 9-speed rates poorly, even though it's quire reliable, because it hunts constantly and shifts unpredictably due to poor programming.

But let's assume for a moment that CR is an authoritative source on this issue. Why then is every single vehicle they warn their readers to avoid specifically because of the likelihood of transmission failure equipped with either a 6-speed or a CVT? Not a single 8, 9, or 10 speed to be found. Curious, don't you think?
https://www.consumerreports.org/car-...o-buy-instead/

 

Well, I won't disagree on CVTs...I have yet to be convinced that they are perfected, particularly the drive-belts. Too many of my neighbors have had to replace them prematurely......either under factory warranty or at their own expense. That is one reason why, on my Encore GX, I specifically ordered it with the larger engine, 9-speed and AWD (the only way you can get the 9-speed)...to avoid the standard CVT with the smaller engine and FWD. I simply don't trust CVTs.


But, as for more conventional transmissions, one must also compare apples to apples.......many of those with 6-speeds are, naturally, older vehicles with more miles on them, and more miles, all else qual, means more chance of failure.