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Originally Posted by JCL
I assume this is a used vehicle and you don't know the history of any previous transmission fluid changes. If you have owned it since new, then you are in a better position.
Changing the transmission fluid at that interval, if it hasn't been changed before, is likely to stir up deposits and is just as likely to cause a failure, IMO. I would leave it alone, but I would ensure there is sufficient fluid in it. I don't think there is a correlation between fluid changes and failure point. Several owners have had transmission failures around that mileage.
Do a search of this forum and you can see quite a range of opinions.
Good luck.
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The transmission isn't like the engine- there aren't high pressures, and the temps aren't going to be even close- so deposits are a lot less likely to form. The other point is that synthetic atf is the factory fill. Considering that even engines don't usually have deposits when run on synthetic oil, I highly doubt an at run on syn will have any.
Fluid breaks down with heat..there's no way around that. Over the many miles, it will break down. imho, I'd change it ever 30k miles and the filter at 60k intervals.