shifting problem 2016 tacos

can you provide us with this info?

 

this is it in a nutshell, if you don't like the 6 speed autos shifting points, buy a Siverado or get a manual transmision

 

I did. You just read it.

 

can we actually see some verification from Toyota or AISIN? maybe you have a link we can go to to review it

 

Not trying to be a jerk, and not saying I don't believe you, as I remember reading about your issues, but some sort of source would give your post more weight.

 

What do you think?

 

hey man I agree I think theres air bubbles in my transmission too, I want file a claim for bad qaulity

 

Understood. Give me a 30 minutes and I will see what I can do.

 

I didn't want a manual tranny so I got auto. With that said I strictly drive in manual mode and don't even know of these shifting issues everyone states. Im afraid to drive it in auto.. lol I have had the most current TSB done tho.

 

If we assume Brad and his source are correct, would this cause any long term degradation or is this simply a "feature" like the rear diff (so the Toyota engineering claims)?

By feature I mean an annoying characteristic.

Can we all agree that Toyota definitely did NOT intentionally design it this way ?

 

Alright fellas, this is about the best I can do. We all know that Toyota is not going to have any document stating they mis-engineered something, thus I can't produce that. As an engineer, working for a global production company, I can assure you that their legal department would assure that a document like this does not exist outside the walls of Toyota, period. Here is what I can tell you though. I worked very closely with a 14 year master tech (Toyota) who is also a friend of mine. We shared a lot of conversation about these trucks (and previous versions as well). Upon analysis of my failed transmission, both he, and the service manager of the dealership, agreed there was some kind of valve body issue with my transmission. I opened up a case with Toyota. They told me there were problems with these transmissions, and the dealership needed to diagnose the issue. After the master tech was able to record the flare on his Techstream, Toyota sent 3 engineers from Japan to analyze the flare on my truck. They used a very specific version of Techstream that allowed them to more accurately isolate a late apply piston response for 4th gear circuit in the valve body. They said this is caused by a bubble, due to leakdown of a sitting valve body. Bear in mind, my transmission fluid level had been manually checked previously, so there was no level issue. They found that, If they purged the bubble, before the truck needed to engage 4th gear (and this can be done with the Techstream), the flare would not occur. The engineers ordered the dealership to ship them my transmission for analysis and for the development of the xxxxx300 calibrations found in the Rev1 version of the transmission TSB that addresses the shift flare. They replaced my transmission with a later datecode. The problem (the 3rd-4th gear shift flare) came back a week later in the new (mid 2017 MP datecode) transmission. Toyota said the 3-4 gear shift flair was characteristic of this vehicle, and they gave me an extended warranty as a good will gesture. A few weeks later a TSB came out that bandaids the leak down. I haven't had it applied yet. Interestingly, I found that if I park my vehicle 10 degrees nose down, overnight, there is no shift flair. If I park my truck less than 10 degrees nose down there is a flare. This tells me the shift in fluid in my pan affects the issue directly. I spoke with a 2nd gen transmission guru, and he spoke of the same leakdown issue in the 2nd gens. Sonnax came up with solutions for the 2 gens, and they will likely come up with a 3rd gen fix as well. That is the best I have. Cheers. PS: you are all welcome for the rev1 TSB.....

 

The flare is bad and should be rectified to protect the longevity of the 4th gear apply clutches. The TSB will address the flare and preserve the clutches. The leak down will not bring about the end of the world. It is just nice if inquisitive minds could understand the issue, hence why we are doing this. The leak down is a result of tolerances and dis-similar materials in the valve body end caps and mating surfaces, coupled by the shrinking of the tranny fluid when cooling.

 

brad, I respect you. but that's not gonna be good enough for the Tacoma world militia.

 

Great.... Alright then... let me have it fellas...

 

whats the flare mean in laymans terms?

 

I was wondering the same thing.

 

has something to do with clutches in the transmission slipping under acceleration I think

 

The flare is when the transmission revs up between a shift. See the below link (hint: start at about 40 seconds in)

https://www.youtube.com/watch?v=M8wDBMY-Vw8

 

I haven't really looked at my tac when I drive but isn't this an inherent characteristic in all auto trans, it may be comparing apples and oranges but when I shifted my manual trans truck it rev 'd the engine between gears

 

An automatic should not increase in RPMs when a shift is taking place.