Sealed Trasmission fluid change

Here's some cool info about toyoter trans oils and their history. Interesting note on how old the WS fluid really is. Have u seen this vid @gearcruncher ?


https://youtu.be/t73jM6mT8sU

 

If you think what you have done is “list my experience” then you are deluding yourself. Your comments were anything BUT only listing experiences. And that’s the issue. You asserted you views as fact. You made claims as to what IS or IS NOT the best approach. Your “tone” has nothing to do with it, even if it is crap. It’s that you dismissed others inputs, asserted yours and others as truth, and otherwise made claims as to what one SHOULD and one SHOULD NOT do.

Don’t think for a minute you offered personal experience and provided recommendations.

 

Wait for it

bet we see a “I can’t help that you took it the wrong way” comment. Next step is to always blame one’s crap on the other party.

 

It’s well established you don’t need to service the transmission. We have points on both sides. I will probably never service my transmission as long as I own the truck. As far as I’m concerned that’s the lifetime of the vehicle.

It’s no different than the oil change argument. Some do it every 3k,5k, 10k, and even 15k. At the end of the day those engines are all performing the same and all lasting just as long.

That said, have you ever had an old transmission say with 250k miles fail because it was serviced? I have. There’s a general understanding with older transmissions that you don’t service them, ever ask yourself why?

I haven’t read anything here presented as a fact except for what’s written in the manual. Maybe take a break.

 

And I have not made any statement as to the nature of servicing the transmission, yet you are specifically addressing my statements and turning the conversation to those points and away from what I have said.

I’m not going to play your games with you. You lack the integrity necessary to be an honest purveyor of information. If you want to offer your viewpoints and experience go ahead, but don’t for one second think that is what you have done so far.

I suggest you take a break and read your own comments, this isn’t others misunderstanding or misplaced frustration.

 

How about this...
Chevrolet produced a 4.3L engine years ago.
I happened to be meeting with engineers at a major filter manufacturer. They were giving me a tour of their lab and test facilities. They had three of those engines on stands doing endurance testing. One was stock with stock spin on filter.
One had this company's external filter with a stick filter elimination block.
The last one had a full blown external dual cartridge filter that was more suited to a lab than a truck engine.
All engines had around the equivalent of 300K miles and the stock engine had filter changes based on manufacturer's recommendations. The other two were measuring the differential pressure between the filter inlet and outlet and filters were changed based on the pressure.
This company's filters were around 3X better and had much more dirt holding capacity.
They had torn down each engine at 50K equivalent miles to check for wear. By 300K the stock filtered engine had only a bit more wear. Remember they changed the oil based on manuals OCI.
This company was doing this to determine if they wanted to enter the consumer market.
In the end they determined that customers would not pay a premium price for no real improvement.
Knowing this, what would your conclusion be? Three random engines started from new and endurance tested identically under lab conditions.
Sometimes I don't ( but probably should) cite these but at the end of the day... who really cares? If I can help one noob reading my post every now and then then I'm okay with that. You do you and I'm okay with that too.

 

One more thing....unless I am speaking about something specific I did with my Tacoma, it is just an opinion like everyone else.
It's like voting... no matter who you are or what you say and even if you have a million followers, you only get one vote. In this case one opinion.

 

What the hell are you raging on about and snapping at me for? Do you realize that you aren't responding to the same person. That fact that you are just raging speaks VOLUMES. I havent even been talking to you until just now.

Sorry to burst your bubble but I'm not hiPSI

Dude seriously take a break as you've contributed nothing to this thread. Maybe someone needs a reply ban.

 

There’s an ignore button. It’s free.

 

heaven forbid in a back and forth with a single person and someone else jumps in I made a mistake. Or that on mobile web the alert text is tiny.
But I made a mistake, shoot me. But if you want to base this on contributing to the thread you damn well better set that bar evenly.

Here, you want contribution?
Industrial isn’t automotive. In true industrial there is measured removal and replacement, not single full replacement. You cannot compare the two. You also cannot compare industrial hydrostatic with clutch based gear selection.
Or how about…
Take some transmission fluid and send it to a lab rather then guessing

 

I think it helps tremendously when we each explain why we feel the way we do. Without the reasoning we have no way of gauging better or not. What you just did in this post is exactly how we all should be replying. If we can’t offer the explanations to help one another, just read, and don’t reply.

 

Ya heaven forbid they apologize for their mistake.

This thread really cleans up when you take out the trash.

So glad TW has an ignore function.

 

Opinion are like AH, everyone has to have one, and since you’ve asked I’ll give my (opinion).

I stopped doing ATF services many years ago before they (A/T) were even sealed on all my personal vehicles.
Before doing so, I got advice from season techs and most all had at least one negative experience after and some recommended to me personally to just leave it alone.

I had my share of negative experiences too, thus the reason I sought advice from the pros before I went ahead to stop servicing ATF on my own vehicles. And when I stopped, the (negative experiences) stopped. I’m glad I listened, and thought I’d pass it along.

Forward years later, but many years ago, it was decided (for warranty reasons) we would service all the ATF fleet vehicles at recommended service intervals, which were around 30k average back then.
Not long after, our A/T repairs went up to at least double the normal average. We went back to not servicing, and the A/T repair requests went back to same averages as before. Take it or leave it, at the end of the day it’s your play.

Because TOYOTA is smart enough to realize that either one or both (front/rear) A/T seals can leak due to premature failure/defect or friction from moving shaft/TC making replacement necessary and ATF fill adjustment necessary. Or even loose lines,punctures etc. It can be as simple as that.

Moreover, I find @hiPSI to be one of the most all around knowledgeable contributors here on TW. We don’t always agree on all things because unlike the majority here, I have my own RL experiences and data points to draw from. However, I do value and respect all his comments.

 

Does anyone have an actual, definitive, technically sound answer to the question of whether the transmission and diff breathers are one or two way?

 

That's what's inside. Mostly semantics at this point lol

 

I guess at this point the only definitive statement would be from Toyota engineering. Ok, back to figuring out what suspension upgrade I’m gonna install.

 

Inside the silver cup goes the spring, then the seal, then the seal sits on top of the threaded bung. Looks like it behaves like a check /poppet valve to me. But yeah the only real definite way is to ask the engineers who built it lol.

ETA: the OEM "two way" does not have the same internals with spring etc. Idk if that answers your question

 

I’d love to hear what everyone has to say about the MT

 

Ok, here’s the thing, no auto manufacturer/engineer that I know of, would design a lubricated component that would allow contaminants to enter the chamber/diff housing. That would almost certainly reduce the reliability/life expectancy of said component. That being said, it is necessary to allow for heat expansion of gases to escape the chamber, if that makes any sense.

Or to put it this way, if you take a deep breath and dive underwater, you can spill-out the inhaled air, but you can’t take any air in while expelling said air. Your diff valve is designed to work the same way, more or less.

Water may however enter the chamber if complete differential axle housing is immersed in standing water for a period of time at either the pinion or axle seals, as they are primarily designed to keep oil inside said chamber. And I mean no disrespect, but having a breather mod is an exercise in futility imo.

 

FWIW......
There are membranes which will allow air to pass in BOTH directions while excluding water and dirt.

@hiPSI I'm so upset.....you tagged me thrice in one post........
Keep doin' what you are doin'
Pay no mind the to the pot stirrers.

As I eluded to earlier. Ignorance will shout the loudest to be sure their point is believed.