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Hi people, did a drain and refill on the transmission. I read somewhere the full level on dipstick should be at 150-170 F temperature. Prior to drain and refill I installed a Scangauge II. One day the temperature got up to 170F (some city and highway) and level was at the full mark. Recently I did a 60 mile trip on a 84 degree day and the temperature read 190F. At my destination I decided to check the level and it was 1/4" above the top full mark on the dipstick. Should that be?? Can't find any info on internet related to ATF temperature versus oil level on dipstick. Can someone help me.
 

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You should be checking the transmission fluid level while the car is running. You may have over filled your transmission oil if it is past the full mark.
 

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Probably nothing to worry about, as the fluid warms up, it will expand. Having fluid 1/4 higher than max isn't optimal, but you can easily drain a bit through the pan to a more desired level. I use to see temps above 200F before i installed a 30K TruCool trans cooler. After that, never saw temps above 180F.
 

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To expand on DL175s post, the trans should be checked as follows: drivetrain fully warmed to normal operating temperature. Drive it maybe 5-8 miles or so. Park on level ground, engine running in Park, pull out dipstick and wipe off a couple of times then take a reading. Should be right around the full/hot mark. Your 1/4" high reading might be because of hotter than normal temps.
 
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