I do understand Toyota put in the owners manual a recommendation on trans maintenance for a trans less than a year old and fluid not much older . Ever think those recommendations are more about $ than part and fluid lifespan?
How many Toyota engineers do you personally know? This thread is asking how many still on original fluid right???
Several transmission re-builders will disagree with your views of flushes and fills not doing any damage, but what do they know right?? You must be the absolute source of knowledge and nobody else can tell you differently even if they are probably more experienced in this field.
It's cool, say my fluid is my source of converter shudder if it makes you feel better, but remember I ordered at least a dozen converters for 4runners or GX's. Several were still under PT warranty. Again, I'm just going off what all I've seen firsthand at a busy Toyota/Lexus dealer that also caters to many Toyota plant employees including engineers:moon:.
less than a year old?? where did you get that from? the maintenance interval stated in the manual for ATF is 60k if towing/abused & 100k otherwise, there is no mention of time... dont think anybody has ever put 60-100k miles on their 4runner in 1 year! they are NOT about money, the intervals are from aisin who makes the trans as well as the toyota engineers that designed & made the vehicle, not some local guy at a dealership that you claim to know.
yes the thread is about how many are still on original fluid, you are the one suggesting & condoning that its ok to go to almost 300k miles on the original fluid... what do your engineer buddies say about that??? what do you think aisin would say about that?
im not aware of any transmission builders or shops that disagree with an exchange of trans fluid, again not flushes! if talking about knowing people in the field matters to you so much, i know quite a few guys & am friends with a few that own trans shops as well as machine shops that build high dollar high horsepower engines that agree with doing trans fluid exchanges or drain & fills just like the vehicle manufacturers do. i also have many lifelong friends that are ASE certified mechanics for 30+ years that would laugh at your suggestion of not following simple maintenance guidelines or going to 300k on factory fluid! what i said is not my opinion & i never claimed to be an "absolute source of knowledge," its common sense & advice from reputable mechanics & educated trans/engine builders that have been doing this for decades, not some guy in the parts dept at a dealership... which by the way are the king of selling you parts & ripping off unknowing customers!
again, converter issues can be & many times are related to fluid issues or abuse... why do you think the shudder fix helps or fixes shudder problems? did it magically rebuild the converter? no. it replenished the additives to help with shudder, same with new fluid that can help the issue. do some reading on here or other forums, countless people report improved or fixed shudder issues with new fluid or an additive. its not just me like you apparently seem to think. & of course the dealership replaced the converter if it was bad or under warranty, dealerships are there to make money.
i will end this here since you seem to think this is my opinion & not based on facts & logic... you do you & keep running your fluids to ridiculous mileage/time & keep trying to justify it... because "whats another $5-$600?" (its easily over $1000 to replace a trans, tell us what your dealership quotes for a trans replacement??!! LOL!) everyone else will follow what the people who design the vehicle & transmission say to do.