Trans temp, whats too high?

1993yj

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Location
Salt Lake
I have heard that after your tranny gets to a certain temp, then for every 10 degrees above the life of your tranny decreases by such a percent. Like I say, I have only heard that there is some sort of formula out there, but I have no idea what the actual numbers are. Anyone know? Its not really that I am worried about it, especailly since I still have a few years of warranty left, but just curious.
 
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