Really wish ppl would stop bringing me trucks with hydraulic fluid in trans

NickTransmissions said:

I primarily do GM then Ford and Dodge with an occasional foreign unit like a BMW ZF or Toyota A340 mixed in...About 3/4s of my non-4L60E stuff is for performance, resto-mod swaps or off-road use. I have a few tool chests just for transmission specialty tools acquired over the years...while they have long since paid for themselves, it's staggering to think about how much cash is laid out for them, in the aggregate and in some cases, individually.

I also do manual transmissions, just not as often...

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KansasOBS said:

I started reading through this, thinking I would actually see info as to why hyguard is bad, been debating the switch. The internal components of the newer JD stuff is not that far off from whats inside my 4l80. I tend to trust hyguard over whatever crap is on the auto parts store shelf.

While I'm not on the rotella train, manufacturers use lighter oils because it allows them to boast higher mpg on the window sticker, and restrictions, etc.

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peezy555 said:

Not trying to correct you but manufacturers variations come from the winter vs summer viscosity. That’s what the W stands for is wetherand that has to do with atmospheric pressure the change That cold weather does to it. Same as variations in stociometric ratio for air fuel ratio which produces ideal emissions

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peezy555 said:

I’ll tell you it was an issue with the type of atf that was used . It was found to have properties that made the wyd hydroscopic (absorbs H2O). Which rusted vanes in torque converter and causing failures This was not discovered till after mileage and use..this is prime example of the 100+ years that these engineers have put in these technologies and continue to improve everyday. They didn’t just come to a conclusion and not give another consideration…and you as an engineer should have an open mind to experiences other than personal . Don’t let the false ego veil your eye of understanding and solely rely on your eyes of seeing

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evilunclegrimace said:

The proper term is "Hygroscopic". Hydroscopic is not a real word.

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Definition of hydroscopic

www.photonics.com

peezy555 said:

Not trying to correct you but manufacturers variations come from the winter vs summer viscosity. That’s what the W stands for is wetherand that has to do with atmospheric pressure the change That cold weather does to it. Same as variations in stociometric ratio for air fuel ratio which produces ideal emissions

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peezy555 said:

Also you gotta take into consideration the amount of money you ultimately spend on atf especially in the beginning that you never get back. It adds up big time

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peezy555 said:

Not trying to correct you but manufacturers variations come from the winter vs summer viscosity. That’s what the W stands for is wetherand that has to do with atmospheric pressure the change That cold weather does to it. Same as variations in stociometric ratio for air fuel ratio which produces ideal emissions

Click to expand...