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Operating temperature for 4l80

DEERE3594

DEERE3594

I welcome everyone...not just Penguins!
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What is the proper operating temperature for a 4l80? What is to hot?
 
190-210 is what I have observed here in CA in the sumertime. ( normal driving )
 
the rule to bear in mind is the hotter it runs the shorter the life. one of the best rule of thumbs was given as outside temp + 100 degrees. normal operating temp should be around 170 to 200. never above 250 for extended periods of time. I have 2 tranny coolers and tcc lock. My temps run 155 in winter and 190-200 with 8k lbs in summer, in traffic it can hit 230.
 
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