trans temp? - Ford Powerstroke Diesel Forum
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Old 04-14-2010, 05:05 PM
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trans temp?

02 7.3 auto, wondering what is the max trans temp you want to see before you start damaging the trans?
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Old 04-14-2010, 05:17 PM
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over 210... i wouldnt go any higher than that
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Old 04-15-2010, 08:28 AM
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IMO 180*
Automatic Transmission Fluid Temperature
Automatic transmission fluid (ATF) has a life of about
100,000 miles at 175*F. At high temperatures, it oxidizes,
turns from red to brown and exhibits a burnt smell. In
addition to reducing the oil’s lubricating quality, high
temperature produces a varnish on internal parts
interfering with the operation of the transmission. Above
250*F., rubber seals harden, leading to pressure loss and
leaks. Also, the transmission can slip. In the worst cases,
clutches fail and costly repairs result.
ATF manufacturers suggest that for every 20*F. increase
in operating temperature above 175*F., the life of the fluid
is cut in half. Hence at 195*F., oil life will be about 50,000
miles. Above 240oF., it becomes nil. Without adequate
coolingwilllikely push the ATF operating temperature very high.
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Old 04-15-2010, 08:32 AM
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at one time i had my tranny temp at 255*, and it scared the crap out of me....once i got home i let it idle for awhile to cool it down and parked it until the next day
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Old 04-16-2010, 04:49 AM
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Sorta a dumb question guys, but if the fluid goes back to the radiator and is cooled at the same temp as the motor, would the temp not be close to 195 ?
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Old 04-16-2010, 04:59 AM
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Quote:
Originally Posted by the witchdoctor View Post
Sorta a dumb question guys, but if the fluid goes back to the radiator and is cooled at the same temp as the motor, would the temp not be close to 195 ?

The transmission has its own cooler, it sits IN FRONT of the radiator and gets the cool air before it hits the radiator, unlike the "old days" when the fluid was routed into the radiator...
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Old 04-16-2010, 08:14 AM
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Quote:
Originally Posted by ffstreetdoc View Post
The transmission has its own cooler, it sits IN FRONT of the radiator and gets the cool air before it hits the radiator, unlike the "old days" when the fluid was routed into the radiator...

actually, I can't speak for all F-series SD's with the 4R100, but ATF 'IS' routed into the lower tank of the engine radiator (of my '02) prior to being routed to it's very own cooler between the engine radiator and intercooler.
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Old 04-16-2010, 03:51 PM
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The trans cooler in the radiator goes into the coolest part of the water. Tha water may be as low as 140&. I wan't to see trans temp from 140 to 180 on normall operation. An occasional 200 or 220 while pulling a heavy load is ok, but not for very long.
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Old 04-16-2010, 03:56 PM
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Actually the fluid is sent to the radiator to warm it up in the winter. Ideal temp for our transmissions is 150 or so I have been told. The cooler in the front is to cool it when it is hot.

The fluid is recirculated within the transmission until it reaches 100 degrees. This is to help it warm up faster.
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Old 04-17-2010, 03:52 PM
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Quote:
Originally Posted by Hank View Post
Actually the fluid is sent to the radiator to warm it up in the winter. Ideal temp for our transmissions is 150 or so I have been told. The cooler in the front is to cool it when it is hot.

The fluid is recirculated within the transmission until it reaches 100 degrees. This is to help it warm up faster.

the best way I have found to keep my tranny cool is to work the engine! get those revs up. if you climb a steep grade...say a gravel mountain road with a trailer, you might want to consider puttin the rig in 4 low, 1st or 2nd. that way, you will get higher revs and can use engine braking on the down hill side. you don't want to coast at 1000 rpms or the tranny temps will soar. air flow is key too of course.
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