Transmission dip stick.

That was a great read. Thanks is for sharing

 

I work with Alison and ZF HD transmissions at work. The breather is surprisingly restrictive. When filling after repairs or services you can pressurize the case and blow the fluid in the long fill tube back at you for a wonderful ATF shower. Ask me how I know

 

Thanks for sharing. Allison’s are expensive to get built, don’t ask me how I know

 

I work with E40/50 Hybrid transmissions. About $100,000 for new. We rebuild inhouse. Glad it's not my money!

 

The Wikipedia article I quoted touches on the subject. It used to require a special type of breather. On modern cars it appears they just look to restrict breather airflow to an absolute minimum. I know there is a phenomena in some systems where the breather has a hose and you are basically just moving the air in the hose back and forth during heating and cooling. I’m not sure if Toyota’s AT breather is at the end of a hose or not.

 

That makes me feel better about spending $4,850

 

I’ve been reading that some are having problems with the 10 speed. Mostly software problems.

 

Yeah. I drive a 2018 F150 at work. It has not had mechanical problems, but for sure the tranny gets confused at times. About once a week your get a hard downshift you don’t expect. Maybe that’s the issue.

 

Google the most common auto trans failure, low fluid, leaks, and bad filter. Not one mention of air in the trans.

 

Because science.

No dip- I highly doubt it has much to do with airflow and oxidation.

The answer pure and simple from a manufacturer's standpoint - money $$$
Less $$$ for less parts
More $$$ replacing transmissions

Non serviceable, sealed, no need to change fluid? I call Bullshit. Not saying there isn't a fluid change schedule for the autos. But a lot of manufacturers state this.

 

Ok. I really don’t think you understand what the automakers are trying to do with the sealed transmissions that are a feature on their most reliable vehicles: To make the majority of transmissions, in normal use, last longer, by preventing oxidization of the fluid.

If you take the time to read the wiki article, you will come to understand that there is a specific issue with Automatic tranny fluid and oxidization. Like brake fluid, it should never be stored in an open container. Or you could still keep arguing some inane point about cost savings by removing a $3 dipstick.

Toyota ditched the dipstick decades ago for good reason as have others. I’d like to have one on my truck, but at the same time understand I’m not your average owner. The average owner just wants blind reliability.

Fact:

You can still check for leaks. Look under the truck.

I would suggest Skoda, Peugeot, and Dodge as companies still offering AT dipsticks.

 

That is what I don't get, how often do you look at the dip stick if available? How often do you drive and heat up the tranny? Every day for one, maybe once a month for the other. How much air are we introducing here? Heat is the number 1 killer of the auto trans.