Trans temp 250*
If you read temp after it has been cooled how can you even begin to see where you need to adjust driving tactics? What temp "trend" will tell you your fluid is cooked when there can be upwards of 100 degrees difference between hot line and pan? You will not see, feel, or smell when ATF+4 has lost its usefulness. Only a chemical analysis is going to tell you that. Seeing how many times the temp spikes is about the only gauge that is available to for judgin when it is time to change the fluid. Its the least inaccurate of all available.

Quite frankly, ATF+4 is way underrated for its ability to withstand abuse. From what I have seen, 99% of us don't ever need a 30k change as we never approach the limits of the fluid. Somebody has to support Amsoil, Chevron. Valvoline and the rest of the oil manufacturers, though.
I have the gauge in the hotline and it acts exactly as stated above. I have seen 250 a couple times running around town in 90+ degree weather. If it is already at 190 or so and I run from one light to another, the tighter converter builds a good bit of heat and since it never locks up between lights, it eventaully gets to the 250 mark. I don't worry about it. If I pull it down to 2nd and let the converter lock, it starts cooling instantly. nature of the beast.
my gauges jump around like that from time to time and its usually my tranny one that does it. its the ground for the gauge, id check there. usually mine buries itself at 250, it will do this while the converter is locked cruising along. its the ground fr the gauge cause it comes back to normal temp and stays there for the duration of my drive.
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