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Old 03-12-2002, 09:55 AM   #1
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Auto trans temps chart

Automatic Transmission Fluid Oxidation
Automatic transmission fluid will provide 100,000 miles of service before oxidation occurs under normal operating temperatures of about 170F. Above normal operating temperatures, the oxidation rate doubles (useful life of fluid is cut in half) with each 20 increase in temperature.

The approximate life expectancy at various temperatures is as follows:

175F 100,000 miles
195F 50,000 miles
212F 25,000 miles
235F 12,000 miles
255F 6,250 miles
275F 3,000 miles
295F 1,500 miles
315F 750 miles
335F 325 miles
355F 160 miles
375F 80 miles
390F 40 miles
415F Less than 30 minutes

This information clearly shows why transmission oil coolers and the various maintenance intervals are recommended for severe usage.

Above 300F, the metals inside the transmission will warp and distort in varying degrees depending on the severity of overheat. Because this damage occurs and fluid life is so seriously impaired, rocking out of snow, mud or sand should never exceed a very few minutes.
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Old 03-12-2002, 11:22 AM   #2
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What do you think about transmission conditioners? At an auto dealership I used to work for they recommended adding this product...
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Old 03-12-2002, 12:38 PM   #3
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trans conditioner???

Please explain. I've spent the greatest part of my life in the mechanical world and have never heard of a trans conditioner. Is this like a filter cooler??? Frank
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Old 03-12-2002, 02:09 PM   #4
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Sorry, what I meant was an additive...there is one particular brand that dealerships sell exclusively ( I can't remeber the name right now) , they make an oil treatment and a transmission conditioner treatment, supposedly makes the trans run cooler.
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Old 03-12-2002, 02:38 PM   #5
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Trans additive ??? Cooling??

In my opinion, there is no additive that allows for better cooling. There are anumber of additives that are supposed to make the old seals soft again. Cooling of a liquid is based mostly by the fluid characteristics as in viscosity. Viscosity is the ability of a fluid to flow under a variety of temps. Mostly it is hard to cool fluid too much. There are t-stats made for extreme temps also....... Frank
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Old 03-12-2002, 08:03 PM   #6
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Frank,
you earned the invisible title of mechanical guru of this forum with the trans temp post.
I would very appreciate your input in the motorhome forum>exhaust thread.
TIA
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Old 03-13-2002, 08:33 AM   #7
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I second Peter's vote. I have been working on cars and trucks all my life ( my family owned a repair business) but Frank has definitely got the knowledge and ability to share it. Thanks for your input. Actually a big thanks to all who input here, Andy from Inland RV, and all the others who share the wealth of knowledge that we all need to tap into.
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Old 05-04-2002, 10:01 PM   #8
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Frank,
where on the transmission can you mount a temperature sending unit?
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Old 05-05-2002, 12:27 AM   #9
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Trans temps monitor

Trans are just a great hydraulic pump of sorts. As with most mechanical devices heat can destroy any. There has been a great debate for a long time to install a temp sender. It is my opinion that the hot fluid line leaving the trans is the best place for a temperature sample. Several "hot rod" product companies make a inline fitting for a temp sender. I'm also NOT a big fan of integrated fluid cooling with engine cooling water, as in radiators with a coil for auto trans. I have found that a devorced fluid cooling system will better serve the trans. Synthetic auto trans fluid will absorb lots of heat with no failure of the unit. Most auto trans like temps about 175-185 F. but modern engines use a 192F thermostat. I've been using a 180 t-stat for about 2 years with no problems. The best trans cooler is mounted in such a fashion to receive ram air but also has a good fan to aid cooling up a long hard pull. Water spray cooling methods are not good. Many guys use plain tap water that is hard water and the coils or plates become coated the mineral deposits and the cooling is negatively effected. When pulling a long hard hill, shifting to a lower gear is a good way to reduce all temps. Factory gages are about 20% too high or too low. Stewart Warner is a great maker of quality gages. Frank
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Old 05-05-2002, 09:42 AM   #10
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I think that the new GM pickups & Suburbans come with a trans temp gauge included in the tow package. I have thought about putting a gauge on my 99 Suburban on my next trans service. GM must think they are worth while if they are starting to include them in the package.
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