Originally Posted by arghx7
I'm sure it's a few Ravigneaux gearsets put together. The 8 speeds out right now are surprisingly more simple than you would expect. It's not like a manual transmission.
That's a big hurdle for the calibration engineers, but the current crop of 8 speeds don't really have that problem. But at least you won't have the annoying drone found in many CVTs.
You do realize that there are teams of engineers getting paid upper middle class salaries to figure this out? And they won't post the confidential details on a car forum.
You do realize that modern automatic transmissions don't use bands right? Something could definitely go wrong but as others have pointed out, modern A/Ts last a long time now especially when you don't put thermal stress on them.
Every manufacturer has a weak link or two in their lineup. Honda has had some good ones but in the late 90s/early 2000s they had some turds.
Jatco CVTs have been holding up well (chiefly Nissans, although they are used in other vehicles).
That's what durability testing is for. It doesn't catch everything though. The complexity is there due to customer demands for improved fuel economy and acceleration, plus tightening government standards. That's why powertrains have been changing so fast lately.
It's hard to say for cars that have been around for only a few years, but my '99 Corolla with 4 speed AT has 222300 miles on it currently. Off the top of my head I think Aisin makes it but I'm not sure.
Except, you know, the silent recalls and everything. My sister's Versa blew its CVT at 40k and was replaced under a TSB/extended warranty. My friend's Murano ate its CVT as well.
CVTs suck to drive, have little to no mileage benefit, and are unreliable. They're the worst transmission choice you can make. I'd rather have a two speed powerglide.